621724456 has 8 divisors (see below), whose sum is σ = 1165733370. Its totient is φ = 310862224.

The previous prime is 621724447. The next prime is 621724469. The reversal of 621724456 is 654427126.

It can be written as a sum of positive squares in only one way, i.e., 580328100 + 41396356 = 24090^2 + 6434^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38857771 + ... + 38857786.

Almost surely, 2^621724456 is an apocalyptic number.

It is an amenable number.

621724456 is a deficient number, since it is larger than the sum of its proper divisors (544008914).

621724456 is a wasteful number, since it uses less digits than its factorization.

621724456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77715563 (or 77715559 counting only the distinct ones).

The product of its digits is 80640, while the sum is 37.

The square root of 621724456 is about 24934.4030608314. The cubic root of 621724456 is about 853.4917293586.

The spelling of 621724456 in words is "six hundred twenty-one million, seven hundred twenty-four thousand, four hundred fifty-six".