625440646 has 4 divisors (see below), whose sum is σ = 938160972. Its totient is φ = 312720322.

The previous prime is 625440623. The next prime is 625440653. The reversal of 625440646 is 646044526.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156360160 + ... + 156360163.

It is an arithmetic number, because the mean of its divisors is an integer number (234540243).

Almost surely, 2^625440646 is an apocalyptic number.

625440646 is a deficient number, since it is larger than the sum of its proper divisors (312720326).

625440646 is a wasteful number, since it uses less digits than its factorization.

625440646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312720325.

The product of its (nonzero) digits is 138240, while the sum is 37.

The square root of 625440646 is about 25008.8113671962. The cubic root of 625440646 is about 855.1888578852.

The spelling of 625440646 in words is "six hundred twenty-five million, four hundred forty thousand, six hundred forty-six".