625440643 has 4 divisors (see below), whose sum is σ = 625493808. Its totient is φ = 625387480.

The previous prime is 625440623. The next prime is 625440653. The reversal of 625440643 is 346044526.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 625440643 - 2⁵ = 625440611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 625440599 and 625440608.

It is not an unprimeable number, because it can be changed into a prime (625440623) 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, 223 + ... + 35368.

It is an arithmetic number, because the mean of its divisors is an integer number (156373452).

Almost surely, 2^625440643 is an apocalyptic number.

625440643 is a deficient number, since it is larger than the sum of its proper divisors (53165).

625440643 is a wasteful number, since it uses less digits than its factorization.

625440643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53164.

The product of its (nonzero) digits is 69120, while the sum is 34.

The square root of 625440643 is about 25008.8113072173. The cubic root of 625440643 is about 855.1888565179.

The spelling of 625440643 in words is "six hundred twenty-five million, four hundred forty thousand, six hundred forty-three".