672640406 has 16 divisors (see below), whose sum is σ = 1040644800. Its totient is φ = 325900800.

The previous prime is 672640391. The next prime is 672640433. The reversal of 672640406 is 604046276.

It is a happy number.

672640406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

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, 25931 + ... + 44918.

It is an arithmetic number, because the mean of its divisors is an integer number (65040300).

Almost surely, 2^672640406 is an apocalyptic number.

672640406 is a deficient number, since it is larger than the sum of its proper divisors (368004394).

672640406 is a wasteful number, since it uses less digits than its factorization.

672640406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70999.

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 672640406 is about 25935.3119510832. The cubic root of 672640406 is about 876.1819807424.

The spelling of 672640406 in words is "six hundred seventy-two million, six hundred forty thousand, four hundred six".