628672761 has 12 divisors (see below), whose sum is σ = 908799892. Its totient is φ = 418784256.

The previous prime is 628672753. The next prime is 628672763. The reversal of 628672761 is 167276826.

It can be written as a sum of positive squares in 2 ways, for example, as 456249600 + 172423161 = 21360^2 + 13131^2 .

It is not a de Polignac number, because 628672761 - 2³ = 628672753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628672763) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15256 + ... + 38601.

Almost surely, 2^628672761 is an apocalyptic number.

It is an amenable number.

628672761 is a deficient number, since it is larger than the sum of its proper divisors (280127131).

628672761 is a wasteful number, since it uses less digits than its factorization.

628672761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55160 (or 55157 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 628672761 is about 25073.3476225254. The cubic root of 628672761 is about 856.6594589437.

The spelling of 628672761 in words is "six hundred twenty-eight million, six hundred seventy-two thousand, seven hundred sixty-one".