64567725280 has 48 divisors (see below), whose sum is σ = 152558051184. Its totient is φ = 25824245760.

The previous prime is 64567725221. The next prime is 64567725281. The reversal of 64567725280 is 8252776546.

It is a super-2 number, since 2×64567725280² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64567725281) 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, 2019499 + ... + 2051221.

It is an arithmetic number, because the mean of its divisors is an integer number (3178292733).

Almost surely, 2^64567725280 is an apocalyptic number.

It is an amenable number.

64567725280 is an abundant number, since it is smaller than the sum of its proper divisors (87990325904).

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

64567725280 is a wasteful number, since it uses less digits than its factorization.

64567725280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44459 (or 44451 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 52.

The spelling of 64567725280 in words is "sixty-four billion, five hundred sixty-seven million, seven hundred twenty-five thousand, two hundred eighty".