638109274 has 8 divisors (see below), whose sum is σ = 1044178848. Its totient is φ = 290049660.

The previous prime is 638109259. The next prime is 638109313. The reversal of 638109274 is 472901836.

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

It is an alternating number because its digits alternate between even and odd.

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, 14502462 + ... + 14502505.

It is an arithmetic number, because the mean of its divisors is an integer number (130522356).

Almost surely, 2^638109274 is an apocalyptic number.

638109274 is a deficient number, since it is larger than the sum of its proper divisors (406069574).

638109274 is a wasteful number, since it uses less digits than its factorization.

638109274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29004980.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 638109274 is about 25260.8248875606. The cubic root of 638109274 is about 860.9244044255.

The spelling of 638109274 in words is "six hundred thirty-eight million, one hundred nine thousand, two hundred seventy-four".