625878021 has 8 divisors (see below), whose sum is σ = 846959584. Its totient is φ = 411024240.

The previous prime is 625877981. The next prime is 625878041. The reversal of 625878021 is 120878526.

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

It is not a de Polignac number, because 625878021 - 2⁶ = 625877957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625878041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1556710 + ... + 1557111.

It is an arithmetic number, because the mean of its divisors is an integer number (105869948).

Almost surely, 2^625878021 is an apocalyptic number.

It is an amenable number.

625878021 is a deficient number, since it is larger than the sum of its proper divisors (221081563).

625878021 is a wasteful number, since it uses less digits than its factorization.

625878021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3113891.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 625878021 is about 25017.5542569613. The cubic root of 625878021 is about 855.3881579434.

The spelling of 625878021 in words is "six hundred twenty-five million, eight hundred seventy-eight thousand, twenty-one".