672404661 has 24 divisors (see below), whose sum is σ = 1029179840. Its totient is φ = 421848000.

The previous prime is 672404659. The next prime is 672404669. The reversal of 672404661 is 166404276.

It is not a de Polignac number, because 672404661 - 2¹ = 672404659 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672404669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12801 + ... + 38841.

Almost surely, 2^672404661 is an apocalyptic number.

It is an amenable number.

672404661 is a deficient number, since it is larger than the sum of its proper divisors (356775179).

672404661 is a wasteful number, since it uses less digits than its factorization.

672404661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26217 (or 26214 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 672404661 is about 25930.7666874699. The cubic root of 672404661 is about 876.0796082340.

The spelling of 672404661 in words is "six hundred seventy-two million, four hundred four thousand, six hundred sixty-one".