66644976 has 40 divisors (see below), whose sum is σ = 172580224. Its totient is φ = 22161600.

The previous prime is 66644971. The next prime is 66644999. The reversal of 66644976 is 67944666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66644971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21951 + ... + 24801.

Almost surely, 2^66644976 is an apocalyptic number.

It is an amenable number.

66644976 is an abundant number, since it is smaller than the sum of its proper divisors (105935248).

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

66644976 is a wasteful number, since it uses less digits than its factorization.

66644976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3349 (or 3343 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 48.

The square root of 66644976 is about 8163.6374245798. The cubic root of 66644976 is about 405.4361525960.

The spelling of 66644976 in words is "sixty-six million, six hundred forty-four thousand, nine hundred seventy-six".