625730621 has 4 divisors (see below), whose sum is σ = 635069952. Its totient is φ = 616391292.

The previous prime is 625730603. The next prime is 625730627. The reversal of 625730621 is 126037526.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 625730621 - 2⁶ = 625730557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625730627) 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, 4669565 + ... + 4669698.

It is an arithmetic number, because the mean of its divisors is an integer number (158767488).

Almost surely, 2^625730621 is an apocalyptic number.

It is an amenable number.

625730621 is a deficient number, since it is larger than the sum of its proper divisors (9339331).

625730621 is an equidigital number, since it uses as much as digits as its factorization.

625730621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9339330.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 625730621 is about 25014.6081520379. The cubic root of 625730621 is about 855.3210020922.

The spelling of 625730621 in words is "six hundred twenty-five million, seven hundred thirty thousand, six hundred twenty-one".