628866864 has 60 divisors (see below), whose sum is σ = 1852591000. Its totient is φ = 198588672.

The previous prime is 628866829. The next prime is 628866869. The reversal of 628866864 is 468668826.

It is a happy number.

628866864 is a `hidden beast` number, since 628 + 8 + 6 + 6 + 8 + 6 + 4 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 628866864.

It is not an unprimeable number, because it can be changed into a prime (628866869) 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, 112189 + ... + 117660.

Almost surely, 2^628866864 is an apocalyptic number.

It is an amenable number.

628866864 is an abundant number, since it is smaller than the sum of its proper divisors (1223724136).

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

628866864 is a wasteful number, since it uses less digits than its factorization.

628866864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229882 (or 229873 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 54.

The square root of 628866864 is about 25077.2180275245. The cubic root of 628866864 is about 856.7476145371.

The spelling of 628866864 in words is "six hundred twenty-eight million, eight hundred sixty-six thousand, eight hundred sixty-four".