64397628 has 36 divisors (see below), whose sum is σ = 163698808. Its totient is φ = 21345120.

The previous prime is 64397623. The next prime is 64397647. The reversal of 64397628 is 82679346.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64397623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1575 + ... + 11457.

Almost surely, 2^64397628 is an apocalyptic number.

It is an amenable number.

64397628 is an abundant number, since it is smaller than the sum of its proper divisors (99301180).

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

64397628 is a wasteful number, since it uses less digits than its factorization.

64397628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10074 (or 10069 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 64397628 is about 8024.8132688555. The cubic root of 64397628 is about 400.8266819819.

It can be divided in two parts, 64397 and 628, that added together give a square (65025 = 255²).

The spelling of 64397628 in words is "sixty-four million, three hundred ninety-seven thousand, six hundred twenty-eight".