646364160 has 396 divisors, whose sum is σ = 2454385752. Its totient is φ = 157188096.

The previous prime is 646364149. The next prime is 646364171. The reversal of 646364160 is 61463646.

646364160 is a `hidden beast` number, since 6 + 4 + 6 + 3 + 641 + 6 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (646364149) and next prime (646364171).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7787479 + ... + 7787561.

Almost surely, 2^646364160 is an apocalyptic number.

646364160 is a gapful number since it is divisible by the number (60) 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 646364160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1227192876).

646364160 is an abundant number, since it is smaller than the sum of its proper divisors (1808021592).

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

646364160 is a wasteful number, since it uses less digits than its factorization.

646364160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 646364160 is about 25423.6928867543. The cubic root of 646364160 is about 864.6209527941.

The spelling of 646364160 in words is "six hundred forty-six million, three hundred sixty-four thousand, one hundred sixty".