625604421 has 16 divisors (see below), whose sum is σ = 915255936. Its totient is φ = 377722176.

The previous prime is 625604417. The next prime is 625604489. The reversal of 625604421 is 124406526.

It is not a de Polignac number, because 625604421 - 2² = 625604417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625604411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149265 + ... + 153398.

It is an arithmetic number, because the mean of its divisors is an integer number (57203496).

Almost surely, 2^625604421 is an apocalyptic number.

It is an amenable number.

625604421 is a deficient number, since it is larger than the sum of its proper divisors (289651515).

625604421 is a wasteful number, since it uses less digits than its factorization.

625604421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302732.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 625604421 is about 25012.0854988144. The cubic root of 625604421 is about 855.2634966394.

The spelling of 625604421 in words is "six hundred twenty-five million, six hundred four thousand, four hundred twenty-one".