638628192 has 48 divisors (see below), whose sum is σ = 1862668080. Its totient is φ = 212875776.

The previous prime is 638628191. The next prime is 638628197. The reversal of 638628192 is 291826836.

638628192 is a `hidden beast` number, since 6 + 3 + 8 + 628 + 19 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (48).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638628191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368713 + ... + 370440.

It is an arithmetic number, because the mean of its divisors is an integer number (38805585).

Almost surely, 2^638628192 is an apocalyptic number.

It is an amenable number.

638628192 is an abundant number, since it is smaller than the sum of its proper divisors (1224039888).

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

638628192 is a wasteful number, since it uses less digits than its factorization.

638628192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739172 (or 739158 counting only the distinct ones).

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

The square root of 638628192 is about 25271.0940008540. The cubic root of 638628192 is about 861.1577124928.

The spelling of 638628192 in words is "six hundred thirty-eight million, six hundred twenty-eight thousand, one hundred ninety-two".