66936864 has 24 divisors (see below), whose sum is σ = 175709520. Its totient is φ = 22312256.

The previous prime is 66936833. The next prime is 66936899. The reversal of 66936864 is 46863966.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 348534 + ... + 348725.

It is an arithmetic number, because the mean of its divisors is an integer number (7321230).

Almost surely, 2^66936864 is an apocalyptic number.

It is an amenable number.

66936864 is an abundant number, since it is smaller than the sum of its proper divisors (108772656).

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

66936864 is a wasteful number, since it uses less digits than its factorization.

66936864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697272 (or 697264 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 48.

The square root of 66936864 is about 8181.4952178682. The cubic root of 66936864 is about 406.0271928853.

The spelling of 66936864 in words is "sixty-six million, nine hundred thirty-six thousand, eight hundred sixty-four".