64639368 has 48 divisors (see below), whose sum is σ = 184282800. Its totient is φ = 20412000.

The previous prime is 64639357. The next prime is 64639369. The reversal of 64639368 is 86393646.

64639368 is a `hidden beast` number, since 6 + 4 + 639 + 3 + 6 + 8 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (64639369) 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, 22258 + ... + 24993.

It is an arithmetic number, because the mean of its divisors is an integer number (3839225).

Almost surely, 2^64639368 is an apocalyptic number.

It is an amenable number.

64639368 is an abundant number, since it is smaller than the sum of its proper divisors (119643432).

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

64639368 is a wasteful number, since it uses less digits than its factorization.

64639368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47282 (or 47275 counting only the distinct ones).

The product of its digits is 559872, while the sum is 45.

The square root of 64639368 is about 8039.8611928316. The cubic root of 64639368 is about 401.3276054512.

The spelling of 64639368 in words is "sixty-four million, six hundred thirty-nine thousand, three hundred sixty-eight".