638892485 has 64 divisors (see below), whose sum is σ = 995328000. Its totient is φ = 382060800.

The previous prime is 638892469. The next prime is 638892493. The reversal of 638892485 is 584298836.

It is not a de Polignac number, because 638892485 - 2⁴ = 638892469 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2374931 + ... + 2375199.

It is an arithmetic number, because the mean of its divisors is an integer number (15552000).

Almost surely, 2^638892485 is an apocalyptic number.

It is an amenable number.

638892485 is a deficient number, since it is larger than the sum of its proper divisors (356435515).

638892485 is a wasteful number, since it uses less digits than its factorization.

638892485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522.

The product of its digits is 3317760, while the sum is 53.

The square root of 638892485 is about 25276.3226162351. The cubic root of 638892485 is about 861.2764913423.

The spelling of 638892485 in words is "six hundred thirty-eight million, eight hundred ninety-two thousand, four hundred eighty-five".