672640407 has 6 divisors (see below), whose sum is σ = 971591712. Its totient is φ = 448426932.

The previous prime is 672640391. The next prime is 672640433. The reversal of 672640407 is 704046276.

672640407 is a `hidden beast` number, since 6 + 7 + 2 + 640 + 4 + 0 + 7 = 666.

It is not a de Polignac number, because 672640407 - 2⁴ = 672640391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672640447) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37368903 + ... + 37368920.

It is an arithmetic number, because the mean of its divisors is an integer number (161931952).

Almost surely, 2^672640407 is an apocalyptic number.

672640407 is a deficient number, since it is larger than the sum of its proper divisors (298951305).

672640407 is a wasteful number, since it uses less digits than its factorization.

672640407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74737829 (or 74737826 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 36.

The square root of 672640407 is about 25935.3119703620. The cubic root of 672640407 is about 876.1819811766.

The spelling of 672640407 in words is "six hundred seventy-two million, six hundred forty thousand, four hundred seven".