645401196 has 192 divisors, whose sum is σ = 1950681600. Its totient is φ = 184757760.

The previous prime is 645401191. The next prime is 645401201. The reversal of 645401196 is 691104546.

645401196 is a `hidden beast` number, since 64 + 5 + 401 + 196 = 666.

It is an interprime number because it is at equal distance from previous prime (645401191) and next prime (645401201).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 645401196.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645401191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1828156 + ... + 1828508.

It is an arithmetic number, because the mean of its divisors is an integer number (10159800).

Almost surely, 2^645401196 is an apocalyptic number.

645401196 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645401196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (975340800).

645401196 is an abundant number, since it is smaller than the sum of its proper divisors (1305280404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645401196 is a wasteful number, since it uses less digits than its factorization.

645401196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 645401196 is about 25404.7475090779. The cubic root of 645401196 is about 864.1913638625.

The spelling of 645401196 in words is "six hundred forty-five million, four hundred one thousand, one hundred ninety-six".