64935720920 has 64 divisors (see below), whose sum is σ = 167035910400. Its totient is φ = 22255896960.

The previous prime is 64935720917. The next prime is 64935720923. The reversal of 64935720920 is 2902753946.

It is an interprime number because it is at equal distance from previous prime (64935720917) and next prime (64935720923).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64935720923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 792851 + ... + 870909.

It is an arithmetic number, because the mean of its divisors is an integer number (2609936100).

Almost surely, 2^64935720920 is an apocalyptic number.

It is an amenable number.

64935720920 is an abundant number, since it is smaller than the sum of its proper divisors (102100189480).

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

64935720920 is a wasteful number, since it uses less digits than its factorization.

64935720920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81048 (or 81044 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 47.

The spelling of 64935720920 in words is "sixty-four billion, nine hundred thirty-five million, seven hundred twenty thousand, nine hundred twenty".