64399520752 has 80 divisors (see below), whose sum is σ = 143362927360. Its totient is φ = 27452307456.

The previous prime is 64399520737. The next prime is 64399520767. The reversal of 64399520752 is 25702599346.

It is an interprime number because it is at equal distance from previous prime (64399520737) and next prime (64399520767).

It is a self number, because there is not a number n which added to its sum of digits gives 64399520752.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21329899 + ... + 21332917.

It is an arithmetic number, because the mean of its divisors is an integer number (1792036592).

Almost surely, 2^64399520752 is an apocalyptic number.

It is an amenable number.

64399520752 is an abundant number, since it is smaller than the sum of its proper divisors (78963406608).

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

64399520752 is a wasteful number, since it uses less digits than its factorization.

64399520752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3990 (or 3984 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 52.

The spelling of 64399520752 in words is "sixty-four billion, three hundred ninety-nine million, five hundred twenty thousand, seven hundred fifty-two".