637713138 has 8 divisors (see below), whose sum is σ = 1275426288. Its totient is φ = 212571044.

The previous prime is 637713113. The next prime is 637713149. The reversal of 637713138 is 831317736.

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

637713138 is an admirable number.

It is a super-3 number, since 3×637713138³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 637713096 and 637713105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53142756 + ... + 53142767.

It is an arithmetic number, because the mean of its divisors is an integer number (159428286).

Almost surely, 2^637713138 is an apocalyptic number.

637713138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

637713138 is a wasteful number, since it uses less digits than its factorization.

637713138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106285528.

The product of its digits is 63504, while the sum is 39.

The square root of 637713138 is about 25252.9827545183. The cubic root of 637713138 is about 860.7462145966.

The spelling of 637713138 in words is "six hundred thirty-seven million, seven hundred thirteen thousand, one hundred thirty-eight".