638890054 has 8 divisors (see below), whose sum is σ = 1045456488. Its totient is φ = 290404560.

The previous prime is 638890051. The next prime is 638890081. The reversal of 638890054 is 450098836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×638890054² = 816361002200245832, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638890051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14520207 + ... + 14520250.

It is an arithmetic number, because the mean of its divisors is an integer number (130682061).

Almost surely, 2^638890054 is an apocalyptic number.

638890054 is a deficient number, since it is larger than the sum of its proper divisors (406566434).

638890054 is a wasteful number, since it uses less digits than its factorization.

638890054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29040470.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 638890054 is about 25276.2745277068. The cubic root of 638890054 is about 861.2753989489.

The spelling of 638890054 in words is "six hundred thirty-eight million, eight hundred ninety thousand, fifty-four".