638769288 has 32 divisors (see below), whose sum is σ = 1690860960. Its totient is φ = 200398080.

The previous prime is 638769269. The next prime is 638769289. The reversal of 638769288 is 882967836.

It is not an unprimeable number, because it can be changed into a prime (638769289) 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 7 ways as a sum of consecutive naturals, for example, 782398 + ... + 783213.

It is an arithmetic number, because the mean of its divisors is an integer number (52839405).

Almost surely, 2^638769288 is an apocalyptic number.

638769288 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

638769288 is an abundant number, since it is smaller than the sum of its proper divisors (1052091672).

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

638769288 is a wasteful number, since it uses less digits than its factorization.

638769288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565637 (or 1565633 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 57.

The square root of 638769288 is about 25273.8854947157. The cubic root of 638769288 is about 861.2211280883.

The spelling of 638769288 in words is "six hundred thirty-eight million, seven hundred sixty-nine thousand, two hundred eighty-eight".