638238000 has 80 divisors (see below), whose sum is σ = 2057698656. Its totient is φ = 170195200.

The previous prime is 638237993. The next prime is 638238043. The reversal of 638238000 is 832836.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47187 + ... + 59186.

Almost surely, 2^638238000 is an apocalyptic number.

638238000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

638238000 is an abundant number, since it is smaller than the sum of its proper divisors (1419460656).

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

638238000 is a wasteful number, since it uses less digits than its factorization.

638238000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106399 (or 106383 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 638238000 is about 25263.3726964552. The cubic root of 638238000 is about 860.9822920570.

The spelling of 638238000 in words is "six hundred thirty-eight million, two hundred thirty-eight thousand".