672788491 has 4 divisors (see below), whose sum is σ = 677304000. Its totient is φ = 668272984.

The previous prime is 672788419. The next prime is 672788497. The reversal of 672788491 is 194887276.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-672788491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672788497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2257531 + ... + 2257828.

It is an arithmetic number, because the mean of its divisors is an integer number (169326000).

Almost surely, 2^672788491 is an apocalyptic number.

672788491 is a deficient number, since it is larger than the sum of its proper divisors (4515509).

672788491 is a wasteful number, since it uses less digits than its factorization.

672788491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4515508.

The product of its digits is 1354752, while the sum is 52.

The square root of 672788491 is about 25938.1666854078. The cubic root of 672788491 is about 876.2462745746.

The spelling of 672788491 in words is "six hundred seventy-two million, seven hundred eighty-eight thousand, four hundred ninety-one".