667072636 has 12 divisors (see below), whose sum is σ = 1184801128. Its totient is φ = 328558032.

The previous prime is 667072621. The next prime is 667072687. The reversal of 667072636 is 636270766.

It is a junction number, because it is equal to n+sod(n) for n = 667072592 and 667072601.

It is a congruent number.

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, 1244271 + ... + 1244806.

Almost surely, 2^667072636 is an apocalyptic number.

It is an amenable number.

667072636 is a deficient number, since it is larger than the sum of its proper divisors (517728492).

667072636 is a wasteful number, since it uses less digits than its factorization.

667072636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2489148 (or 2489146 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 43.

The square root of 667072636 is about 25827.7493405833. The cubic root of 667072636 is about 873.7577521940.

The spelling of 667072636 in words is "six hundred sixty-seven million, seventy-two thousand, six hundred thirty-six".