672157257 has 4 divisors (see below), whose sum is σ = 896209680. Its totient is φ = 448104836.

The previous prime is 672157247. The next prime is 672157259. The reversal of 672157257 is 752751276.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 672157257 - 2⁶ = 672157193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (672157259) 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, 112026207 + ... + 112026212.

It is an arithmetic number, because the mean of its divisors is an integer number (224052420).

Almost surely, 2^672157257 is an apocalyptic number.

It is an amenable number.

672157257 is a deficient number, since it is larger than the sum of its proper divisors (224052423).

672157257 is a wasteful number, since it uses less digits than its factorization.

672157257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224052422.

The product of its digits is 205800, while the sum is 42.

The square root of 672157257 is about 25925.9957764403. The cubic root of 672157257 is about 875.9721470575.

The spelling of 672157257 in words is "six hundred seventy-two million, one hundred fifty-seven thousand, two hundred fifty-seven".