64638312 has 16 divisors (see below), whose sum is σ = 161595840. Its totient is φ = 21546096.

The previous prime is 64638311. The next prime is 64638337. The reversal of 64638312 is 21383646.

It is a super-2 number, since 2×64638312² = 8356222756418688, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (64638311) 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, 1346608 + ... + 1346655.

It is an arithmetic number, because the mean of its divisors is an integer number (10099740).

Almost surely, 2^64638312 is an apocalyptic number.

It is an amenable number.

64638312 is an abundant number, since it is smaller than the sum of its proper divisors (96957528).

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

64638312 is a wasteful number, since it uses less digits than its factorization.

64638312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2693272 (or 2693268 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 64638312 is about 8039.7955197878. The cubic root of 64638312 is about 401.3254199706.

The spelling of 64638312 in words is "sixty-four million, six hundred thirty-eight thousand, three hundred twelve".