628128936 has 24 divisors (see below), whose sum is σ = 1701182730. Its totient is φ = 209376288.

The previous prime is 628128911. The next prime is 628128967. The reversal of 628128936 is 639821826.

628128936 is a `hidden beast` number, since 628 + 12 + 8 + 9 + 3 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 356076900 + 272052036 = 18870^2 + 16494^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 628128891 and 628128900.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4361935 + ... + 4362078.

Almost surely, 2^628128936 is an apocalyptic number.

It is an amenable number.

628128936 is an abundant number, since it is smaller than the sum of its proper divisors (1073053794).

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

628128936 is a wasteful number, since it uses less digits than its factorization.

628128936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8724025 (or 8724018 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 628128936 is about 25062.5005935162. The cubic root of 628128936 is about 856.4123737317.

The spelling of 628128936 in words is "six hundred twenty-eight million, one hundred twenty-eight thousand, nine hundred thirty-six".