638376260 has 12 divisors (see below), whose sum is σ = 1340590188. Its totient is φ = 255350496.

The previous prime is 638376259. The next prime is 638376289. The reversal of 638376260 is 62673836.

It can be written as a sum of positive squares in 2 ways, for example, as 476374276 + 162001984 = 21826^2 + 12728^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

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, 15959387 + ... + 15959426.

It is an arithmetic number, because the mean of its divisors is an integer number (111715849).

Almost surely, 2^638376260 is an apocalyptic number.

It is an amenable number.

638376260 is an abundant number, since it is smaller than the sum of its proper divisors (702213928).

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

638376260 is a wasteful number, since it uses less digits than its factorization.

638376260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31918822 (or 31918820 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 638376260 is about 25266.1089208449. The cubic root of 638376260 is about 861.0444584260.

The spelling of 638376260 in words is "six hundred thirty-eight million, three hundred seventy-six thousand, two hundred sixty".