66979932 has 24 divisors (see below), whose sum is σ = 165480336. Its totient is φ = 21013248.

The previous prime is 66979931. The next prime is 66979961. The reversal of 66979932 is 23997966.

It is a super-2 number, since 2×66979932² = 8972622581449248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66979931) 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, 163963 + ... + 164370.

It is an arithmetic number, because the mean of its divisors is an integer number (6895014).

Almost surely, 2^66979932 is an apocalyptic number.

It is an amenable number.

66979932 is an abundant number, since it is smaller than the sum of its proper divisors (98500404).

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

66979932 is a wasteful number, since it uses less digits than its factorization.

66979932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328357 (or 328355 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 51.

The square root of 66979932 is about 8184.1268318618. The cubic root of 66979932 is about 406.1142551757.

It can be divided in two parts, 669 and 79932, that added together give a triangular number (80601 = T₄₀₁).

The spelling of 66979932 in words is "sixty-six million, nine hundred seventy-nine thousand, nine hundred thirty-two".