646428415320 has 112 divisors (see below), whose sum is σ = 2180698425360. Its totient is φ = 172380902976.

The previous prime is 646428415307. The next prime is 646428415331. The reversal of 646428415320 is 23514824646.

646428415320 is a `hidden beast` number, since 6 + 46 + 4 + 284 + 1 + 5 + 320 = 666.

It is a super-2 number, since 2×646428415320² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 11055004 + ... + 11113323.

It is an arithmetic number, because the mean of its divisors is an integer number (19470521655).

Almost surely, 2^646428415320 is an apocalyptic number.

646428415320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646428415320 is an abundant number, since it is smaller than the sum of its proper divisors (1534270010040).

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

646428415320 is a wasteful number, since it uses less digits than its factorization.

646428415320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22168356 (or 22168337 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 45.

The spelling of 646428415320 in words is "six hundred forty-six billion, four hundred twenty-eight million, four hundred fifteen thousand, three hundred twenty".