638867350 has 48 divisors (see below), whose sum is σ = 1306362816. Its totient is φ = 230516000.

The previous prime is 638867329. The next prime is 638867377. The reversal of 638867350 is 53768836.

It is a self number, because there is not a number n which added to its sum of digits gives 638867350.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67617 + ... + 76483.

It is an arithmetic number, because the mean of its divisors is an integer number (27215892).

Almost surely, 2^638867350 is an apocalyptic number.

638867350 is an abundant number, since it is smaller than the sum of its proper divisors (667495466).

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

638867350 is a wasteful number, since it uses less digits than its factorization.

638867350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9021 (or 9016 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 46.

The square root of 638867350 is about 25275.8254068982. The cubic root of 638867350 is about 861.2651965527.

The spelling of 638867350 in words is "six hundred thirty-eight million, eight hundred sixty-seven thousand, three hundred fifty".