64920402892788 has 24 divisors (see below), whose sum is σ = 151496503999008. Its totient is φ = 21637910881056.

The previous prime is 64920402892781. The next prime is 64920402892789. The reversal of 64920402892788 is 88729820402946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64920402892781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277805406 + ... + 278038997.

It is an arithmetic number, because the mean of its divisors is an integer number (6312354333292).

Almost surely, 2^{64920402892788} is an apocalyptic number.

It is an amenable number.

64920402892788 is an abundant number, since it is smaller than the sum of its proper divisors (86576101106220).

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

64920402892788 is a wasteful number, since it uses less digits than its factorization.

64920402892788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555854143 (or 555854141 counting only the distinct ones).

The product of its (nonzero) digits is 222953472, while the sum is 69.

The spelling of 64920402892788 in words is "sixty-four trillion, nine hundred twenty billion, four hundred two million, eight hundred ninety-two thousand, seven hundred eighty-eight".