628749018 has 24 divisors (see below), whose sum is σ = 1363170900. Its totient is φ = 209447424.

The previous prime is 628749001. The next prime is 628749059. The reversal of 628749018 is 810947826.

628749018 is a `hidden beast` number, since 628 + 7 + 4 + 9 + 0 + 18 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 627652809 + 1096209 = 25053^2 + 1047^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19578 + ... + 40506.

Almost surely, 2^628749018 is an apocalyptic number.

628749018 is an abundant number, since it is smaller than the sum of its proper divisors (734421882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

628749018 is a wasteful number, since it uses less digits than its factorization.

628749018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22606 (or 22603 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 628749018 is about 25074.8682548882. The cubic root of 628749018 is about 856.6940946839.

The spelling of 628749018 in words is "six hundred twenty-eight million, seven hundred forty-nine thousand, eighteen".