638772162 has 16 divisors (see below), whose sum is σ = 1460050752. Its totient is φ = 182506320.

The previous prime is 638772097. The next prime is 638772259. The reversal of 638772162 is 261277836.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 15208861 = 638772162 / (6 + 3 + 8 + 7 + 7 + 2 + 1 + 6 + 2).

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 7 ways as a sum of consecutive naturals, for example, 7604389 + ... + 7604472.

It is an arithmetic number, because the mean of its divisors is an integer number (91253172).

Almost surely, 2^638772162 is an apocalyptic number.

638772162 is an abundant number, since it is smaller than the sum of its proper divisors (821278590).

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

638772162 is a wasteful number, since it uses less digits than its factorization.

638772162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15208873.

The product of its digits is 169344, while the sum is 42.

The square root of 638772162 is about 25273.9423517583. The cubic root of 638772162 is about 861.2224197105. Note that the first 3 decimals are identical.

The spelling of 638772162 in words is "six hundred thirty-eight million, seven hundred seventy-two thousand, one hundred sixty-two".