64399236 has 24 divisors (see below), whose sum is σ = 163925664. Its totient is φ = 19514880.

The previous prime is 64399211. The next prime is 64399249. The reversal of 64399236 is 63299346.

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, 243805 + ... + 244068.

It is an arithmetic number, because the mean of its divisors is an integer number (6830236).

Almost surely, 2^64399236 is an apocalyptic number.

64399236 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

64399236 is an abundant number, since it is smaller than the sum of its proper divisors (99526428).

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

64399236 is a wasteful number, since it uses less digits than its factorization.

64399236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487891 (or 487889 counting only the distinct ones).

The product of its digits is 209952, while the sum is 42.

The square root of 64399236 is about 8024.9134574773. The cubic root of 64399236 is about 400.8300181500.

The spelling of 64399236 in words is "sixty-four million, three hundred ninety-nine thousand, two hundred thirty-six".