672561823 has 4 divisors (see below), whose sum is σ = 695753640. Its totient is φ = 649370008.

The previous prime is 672561821. The next prime is 672561847. The reversal of 672561823 is 328165276.

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 672561823 - 2¹ = 672561821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672561821) 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, 11595865 + ... + 11595922.

It is an arithmetic number, because the mean of its divisors is an integer number (173938410).

Almost surely, 2^672561823 is an apocalyptic number.

672561823 is a deficient number, since it is larger than the sum of its proper divisors (23191817).

672561823 is a wasteful number, since it uses less digits than its factorization.

672561823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23191816.

The product of its digits is 120960, while the sum is 40.

The square root of 672561823 is about 25933.7969260191. The cubic root of 672561823 is about 876.1478586521.

The spelling of 672561823 in words is "six hundred seventy-two million, five hundred sixty-one thousand, eight hundred twenty-three".