66004644 has 12 divisors (see below), whose sum is σ = 154010864. Its totient is φ = 22001544.

The previous prime is 66004607. The next prime is 66004661. The reversal of 66004644 is 44640066.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×66004644² = 8713226059133472, 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, 2750182 + ... + 2750205.

Almost surely, 2^66004644 is an apocalyptic number.

It is an amenable number.

66004644 is an abundant number, since it is smaller than the sum of its proper divisors (88006220).

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

66004644 is a wasteful number, since it uses less digits than its factorization.

66004644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5500394 (or 5500392 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 66004644 is about 8124.3242180504. The cubic root of 66004644 is about 404.1334803847.

The spelling of 66004644 in words is "sixty-six million, four thousand, six hundred forty-four".