624406221 has 12 divisors (see below), whose sum is σ = 933021180. Its totient is φ = 401916480.

The previous prime is 624406213. The next prime is 624406249. The reversal of 624406221 is 122604426.

It can be written as a sum of positive squares in 2 ways, for example, as 468506025 + 155900196 = 21645^2 + 12486^2 .

It is not a de Polignac number, because 624406221 - 2³ = 624406213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (624406121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1195920 + ... + 1196441.

It is an arithmetic number, because the mean of its divisors is an integer number (77751765).

Almost surely, 2^624406221 is an apocalyptic number.

It is an amenable number.

624406221 is a deficient number, since it is larger than the sum of its proper divisors (308614959).

624406221 is a wasteful number, since it uses less digits than its factorization.

624406221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2392396 (or 2392393 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 624406221 is about 24988.1215980714. The cubic root of 624406221 is about 854.7171281330.

The spelling of 624406221 in words is "six hundred twenty-four million, four hundred six thousand, two hundred twenty-one".