625644423 has 6 divisors (see below), whose sum is σ = 903708624. Its totient is φ = 417096276.

The previous prime is 625644391. The next prime is 625644427. The reversal of 625644423 is 324446526.

625644423 is a `hidden beast` number, since 6 + 2 + 5 + 644 + 4 + 2 + 3 = 666.

It is not a de Polignac number, because 625644423 - 2⁵ = 625644391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625644427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34758015 + ... + 34758032.

It is an arithmetic number, because the mean of its divisors is an integer number (150618104).

Almost surely, 2^625644423 is an apocalyptic number.

625644423 is a deficient number, since it is larger than the sum of its proper divisors (278064201).

625644423 is a wasteful number, since it uses less digits than its factorization.

625644423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69516053 (or 69516050 counting only the distinct ones).

The product of its digits is 138240, while the sum is 36.

The square root of 625644423 is about 25012.8851394636. The cubic root of 625644423 is about 855.2817251558.

The spelling of 625644423 in words is "six hundred twenty-five million, six hundred forty-four thousand, four hundred twenty-three".