64665388 has 12 divisors (see below), whose sum is σ = 113596560. Its totient is φ = 32209232.

The previous prime is 64665347. The next prime is 64665407. The reversal of 64665388 is 88356646.

It is a super-2 number, since 2×64665388² = 8363224810381088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29683 + ... + 31786.

It is an arithmetic number, because the mean of its divisors is an integer number (9466380).

Almost surely, 2^64665388 is an apocalyptic number.

It is an amenable number.

64665388 is a deficient number, since it is larger than the sum of its proper divisors (48931172).

64665388 is a wasteful number, since it uses less digits than its factorization.

64665388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61736 (or 61734 counting only the distinct ones).

The product of its digits is 829440, while the sum is 46.

The square root of 64665388 is about 8041.4792171590. The cubic root of 64665388 is about 401.3814485076.

The spelling of 64665388 in words is "sixty-four million, six hundred sixty-five thousand, three hundred eighty-eight".