672554021 has 4 divisors (see below), whose sum is σ = 694249344. Its totient is φ = 650858700.

The previous prime is 672553997. The next prime is 672554033. The reversal of 672554021 is 120455276.

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 a de Polignac number, because none of the positive numbers 2^k-672554021 is a prime.

It is a super-2 number, since 2×672554021² = 904657822326536882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672554081) 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, 10847615 + ... + 10847676.

It is an arithmetic number, because the mean of its divisors is an integer number (173562336).

Almost surely, 2^672554021 is an apocalyptic number.

It is an amenable number.

672554021 is a deficient number, since it is larger than the sum of its proper divisors (21695323).

672554021 is a wasteful number, since it uses less digits than its factorization.

672554021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21695322.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 672554021 is about 25933.6465041074. The cubic root of 672554021 is about 876.1444707444.

The spelling of 672554021 in words is "six hundred seventy-two million, five hundred fifty-four thousand, twenty-one".