672389815 has 4 divisors (see below), whose sum is σ = 806867784. Its totient is φ = 537911848.

The previous prime is 672389813. The next prime is 672389897. The reversal of 672389815 is 518983276.

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

It is a cyclic number.

It is not a de Polignac number, because 672389815 - 2¹ = 672389813 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672389813) 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, 67238977 + ... + 67238986.

It is an arithmetic number, because the mean of its divisors is an integer number (201716946).

Almost surely, 2^672389815 is an apocalyptic number.

672389815 is a deficient number, since it is larger than the sum of its proper divisors (134477969).

672389815 is a wasteful number, since it uses less digits than its factorization.

672389815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134477968.

The product of its digits is 725760, while the sum is 49.

The square root of 672389815 is about 25930.4804236250. The cubic root of 672389815 is about 876.0731605425.

The spelling of 672389815 in words is "six hundred seventy-two million, three hundred eighty-nine thousand, eight hundred fifteen".