628640025 has 144 divisors (see below), whose sum is σ = 1253503104. Its totient is φ = 275742720.

The previous prime is 628640021. The next prime is 628640039. The reversal of 628640025 is 520046826.

It is not a de Polignac number, because 628640025 - 2² = 628640021 is a prime.

It is not an unprimeable number, because it can be changed into a prime (628640021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 6480777 + ... + 6480873.

Almost surely, 2^628640025 is an apocalyptic number.

628640025 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

628640025 is a deficient number, since it is larger than the sum of its proper divisors (624863079).

628640025 is a wasteful number, since it uses less digits than its factorization.

628640025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 628640025 is about 25072.6948092940. The cubic root of 628640025 is about 856.6445894745.

The spelling of 628640025 in words is "six hundred twenty-eight million, six hundred forty thousand, twenty-five".