64508720 has 40 divisors (see below), whose sum is σ = 152453040. Its totient is φ = 25378560.

The previous prime is 64508701. The next prime is 64508747. The reversal of 64508720 is 2780546.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×64508720² = 8322749912076800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1730 + ... + 11489.

It is an arithmetic number, because the mean of its divisors is an integer number (3811326).

Almost surely, 2^64508720 is an apocalyptic number.

It is an amenable number.

64508720 is an abundant number, since it is smaller than the sum of its proper divisors (87944320).

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

64508720 is a wasteful number, since it uses less digits than its factorization.

64508720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13293 (or 13287 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 64508720 is about 8031.7320672443. The cubic root of 64508720 is about 401.0570375518.

The spelling of 64508720 in words is "sixty-four million, five hundred eight thousand, seven hundred twenty".