66683772 has 18 divisors (see below), whose sum is σ = 168561848. Its totient is φ = 22227912.

The previous prime is 66683767. The next prime is 66683819. The reversal of 66683772 is 27738666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 926128 + ... + 926199.

Almost surely, 2^66683772 is an apocalyptic number.

It is an amenable number.

66683772 is an abundant number, since it is smaller than the sum of its proper divisors (101878076).

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

66683772 is a wasteful number, since it uses less digits than its factorization.

66683772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852337 (or 1852332 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The square root of 66683772 is about 8166.0132255587. The cubic root of 66683772 is about 405.5148094368.

It can be divided in two parts, 6668 and 3772, that added together give a triangular number (10440 = T₁₄₄).

The spelling of 66683772 in words is "sixty-six million, six hundred eighty-three thousand, seven hundred seventy-two".