625504021 has 8 divisors (see below), whose sum is σ = 658690560. Its totient is φ = 592816752.

The previous prime is 625503973. The next prime is 625504057. The reversal of 625504021 is 120405526.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 625504021 - 2²⁷ = 491286293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625504921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122245 + ... + 127258.

It is an arithmetic number, because the mean of its divisors is an integer number (82336320).

Almost surely, 2^625504021 is an apocalyptic number.

It is an amenable number.

625504021 is a deficient number, since it is larger than the sum of its proper divisors (33186539).

625504021 is a wasteful number, since it uses less digits than its factorization.

625504021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249635.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 625504021 is about 25010.0783885217. The cubic root of 625504021 is about 855.2177419281.

Adding to 625504021 its reverse (120405526), we get a palindrome (745909547).

The spelling of 625504021 in words is "six hundred twenty-five million, five hundred four thousand, twenty-one".