64442388 has 24 divisors (see below), whose sum is σ = 150916192. Its totient is φ = 21402144.

The previous prime is 64442381. The next prime is 64442401. The reversal of 64442388 is 88324446.

It is a super-2 number, since 2×64442388² = 8305642742285088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64442381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6370 + ... + 13017.

Almost surely, 2^64442388 is an apocalyptic number.

It is an amenable number.

64442388 is an abundant number, since it is smaller than the sum of its proper divisors (86473804).

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

64442388 is a wasteful number, since it uses less digits than its factorization.

64442388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19671 (or 19669 counting only the distinct ones).

The product of its digits is 147456, while the sum is 39.

The square root of 64442388 is about 8027.6016343613. The cubic root of 64442388 is about 400.9195262257.

The spelling of 64442388 in words is "sixty-four million, four hundred forty-two thousand, three hundred eighty-eight".