64665272 has 16 divisors (see below), whose sum is σ = 138568560. Its totient is φ = 27713664.

The previous prime is 64665269. The next prime is 64665277. The reversal of 64665272 is 27256646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64665277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 577313 + ... + 577424.

It is an arithmetic number, because the mean of its divisors is an integer number (8660535).

Almost surely, 2^64665272 is an apocalyptic number.

It is an amenable number.

64665272 is an abundant number, since it is smaller than the sum of its proper divisors (73903288).

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

64665272 is a wasteful number, since it uses less digits than its factorization.

64665272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154750 (or 1154746 counting only the distinct ones).

The product of its digits is 120960, while the sum is 38.

The square root of 64665272 is about 8041.4720045524. The cubic root of 64665272 is about 401.3812085015.

The spelling of 64665272 in words is "sixty-four million, six hundred sixty-five thousand, two hundred seventy-two".