672537891 has 16 divisors (see below), whose sum is σ = 911086848. Its totient is φ = 441228000.

The previous prime is 672537857. The next prime is 672537911. The reversal of 672537891 is 198735276.

It is not a de Polignac number, because 672537891 - 2⁹ = 672537379 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 672537891.

It is not an unprimeable number, because it can be changed into a prime (672530891) 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, 43956 + ... + 57246.

It is an arithmetic number, because the mean of its divisors is an integer number (56942928).

Almost surely, 2^672537891 is an apocalyptic number.

672537891 is a deficient number, since it is larger than the sum of its proper divisors (238548957).

672537891 is a wasteful number, since it uses less digits than its factorization.

672537891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13562.

The product of its digits is 635040, while the sum is 48.

The square root of 672537891 is about 25933.3355162810. The cubic root of 672537891 is about 876.1374664380.

The spelling of 672537891 in words is "six hundred seventy-two million, five hundred thirty-seven thousand, eight hundred ninety-one".