634228728 has 32 divisors (see below), whose sum is σ = 1812082560. Its totient is φ = 181208160.

The previous prime is 634228717. The next prime is 634228733. The reversal of 634228728 is 827822436.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 634228728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1887418 + ... + 1887753.

It is an arithmetic number, because the mean of its divisors is an integer number (56627580).

Almost surely, 2^634228728 is an apocalyptic number.

It is an amenable number.

634228728 is an abundant number, since it is smaller than the sum of its proper divisors (1177853832).

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

634228728 is a wasteful number, since it uses less digits than its factorization.

634228728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3775187 (or 3775183 counting only the distinct ones).

The product of its digits is 258048, while the sum is 42.

The square root of 634228728 is about 25183.8981891208. The cubic root of 634228728 is about 859.1756694593.

The spelling of 634228728 in words is "six hundred thirty-four million, two hundred twenty-eight thousand, seven hundred twenty-eight".