672640408 has 32 divisors (see below), whose sum is σ = 1385922960. Its totient is φ = 303508480.

The previous prime is 672640391. The next prime is 672640433. The reversal of 672640408 is 804046276.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15841 + ... + 39952.

Almost surely, 2^672640408 is an apocalyptic number.

It is an amenable number.

672640408 is an abundant number, since it is smaller than the sum of its proper divisors (713282552).

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

672640408 is a wasteful number, since it uses less digits than its factorization.

672640408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55947 (or 55943 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 672640408 is about 25935.3119896407. The cubic root of 672640408 is about 876.1819816108.

The spelling of 672640408 in words is "six hundred seventy-two million, six hundred forty thousand, four hundred eight".