672720923 has 16 divisors (see below), whose sum is σ = 818947584. Its totient is φ = 539433600.

The previous prime is 672720901. The next prime is 672720929. The reversal of 672720923 is 329027276.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-672720923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (672720929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2948 + ... + 36798.

It is an arithmetic number, because the mean of its divisors is an integer number (51184224).

Almost surely, 2^672720923 is an apocalyptic number.

672720923 is a deficient number, since it is larger than the sum of its proper divisors (146226661).

672720923 is a wasteful number, since it uses less digits than its factorization.

672720923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34042.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 672720923 is about 25936.8641705199. The cubic root of 672720923 is about 876.2169398524.

The spelling of 672720923 in words is "six hundred seventy-two million, seven hundred twenty thousand, nine hundred twenty-three".