645562104 has 192 divisors, whose sum is σ = 1875363840. Its totient is φ = 184800000.

The previous prime is 645562037. The next prime is 645562109. The reversal of 645562104 is 401265546.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645562109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6391654 + ... + 6391754.

It is an arithmetic number, because the mean of its divisors is an integer number (9767520).

Almost surely, 2^645562104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645562104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (937681920).

645562104 is an abundant number, since it is smaller than the sum of its proper divisors (1229801736).

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

645562104 is a wasteful number, since it uses less digits than its factorization.

645562104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 645562104 is about 25407.9142001070. The cubic root of 645562104 is about 864.2631764292.

The spelling of 645562104 in words is "six hundred forty-five million, five hundred sixty-two thousand, one hundred four".