64772570520 has 192 divisors, whose sum is σ = 241222176000. Its totient is φ = 14765877504.

The previous prime is 64772570509. The next prime is 64772570563. The reversal of 64772570520 is 2507527746.

64772570520 is a `hidden beast` number, since 6 + 4 + 7 + 72 + 57 + 0 + 520 = 666.

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 47 ways as a sum of consecutive naturals, for example, 921171 + ... + 988989.

It is an arithmetic number, because the mean of its divisors is an integer number (1256365500).

Almost surely, 2^64772570520 is an apocalyptic number.

64772570520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64772570520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120611088000).

64772570520 is an abundant number, since it is smaller than the sum of its proper divisors (176449605480).

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

64772570520 is a wasteful number, since it uses less digits than its factorization.

64772570520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68222 (or 68215 counting only the distinct ones).

The product of its (nonzero) digits is 823200, while the sum is 45.

The spelling of 64772570520 in words is "sixty-four billion, seven hundred seventy-two million, five hundred seventy thousand, five hundred twenty".