625792421 has 4 divisors (see below), whose sum is σ = 647371500. Its totient is φ = 604213344.

The previous prime is 625792393. The next prime is 625792463. The reversal of 625792421 is 124297526.

625792421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 271788196 + 354004225 = 16486^2 + 18815^2 .

It is a cyclic number.

It is not a de Polignac number, because 625792421 - 2¹⁸ = 625530277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625792621) 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, 10789496 + ... + 10789553.

It is an arithmetic number, because the mean of its divisors is an integer number (161842875).

Almost surely, 2^625792421 is an apocalyptic number.

It is an amenable number.

625792421 is a deficient number, since it is larger than the sum of its proper divisors (21579079).

625792421 is a wasteful number, since it uses less digits than its factorization.

625792421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21579078.

The product of its digits is 60480, while the sum is 38.

The square root of 625792421 is about 25015.8433997337. The cubic root of 625792421 is about 855.3491596284.

The spelling of 625792421 in words is "six hundred twenty-five million, seven hundred ninety-two thousand, four hundred twenty-one".