638093700 has 126 divisors (see below), whose sum is σ = 2076282474. Its totient is φ = 170138880.

The previous prime is 638093683. The next prime is 638093713. The reversal of 638093700 is 7390836.

It can be written as a sum of positive squares in 3 ways, for example, as 126157824 + 511935876 = 11232^2 + 22626^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 68524 + ... + 77276.

Almost surely, 2^638093700 is an apocalyptic number.

638093700 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638093700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1038141237).

638093700 is an abundant number, since it is smaller than the sum of its proper divisors (1438188774).

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

638093700 is a wasteful number, since it uses less digits than its factorization.

638093700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8785 (or 8763 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 638093700 is about 25260.5166217954. The cubic root of 638093700 is about 860.9174003243.

The spelling of 638093700 in words is "six hundred thirty-eight million, ninety-three thousand, seven hundred".