628625961 has 8 divisors (see below), whose sum is σ = 931297760. Its totient is φ = 419083956.

The previous prime is 628625939. The next prime is 628625993. The reversal of 628625961 is 169526826.

It is not a de Polignac number, because 628625961 - 2⁵ = 628625929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628625911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11641195 + ... + 11641248.

It is an arithmetic number, because the mean of its divisors is an integer number (116412220).

Almost surely, 2^628625961 is an apocalyptic number.

It is an amenable number.

628625961 is a deficient number, since it is larger than the sum of its proper divisors (302671799).

628625961 is a wasteful number, since it uses less digits than its factorization.

628625961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23282452 (or 23282446 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 628625961 is about 25072.4143432578. The cubic root of 628625961 is about 856.6382011129.

The spelling of 628625961 in words is "six hundred twenty-eight million, six hundred twenty-five thousand, nine hundred sixty-one".