64793644920 has 48 divisors (see below), whose sum is σ = 210579347160. Its totient is φ = 17278305216.

The previous prime is 64793644901. The next prime is 64793644933. The reversal of 64793644920 is 2944639746.

64793644920 is a `hidden beast` number, since 6 + 4 + 7 + 93 + 64 + 492 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89990814 + ... + 89991533.

Almost surely, 2^64793644920 is an apocalyptic number.

64793644920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64793644920 is an abundant number, since it is smaller than the sum of its proper divisors (145785702240).

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

64793644920 is a wasteful number, since it uses less digits than its factorization.

64793644920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179982364 (or 179982357 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 54.

The spelling of 64793644920 in words is "sixty-four billion, seven hundred ninety-three million, six hundred forty-four thousand, nine hundred twenty".