638331086 has 4 divisors (see below), whose sum is σ = 957496632. Its totient is φ = 319165542.

The previous prime is 638331059. The next prime is 638331097. The reversal of 638331086 is 680133836.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159582770 + ... + 159582773.

It is an arithmetic number, because the mean of its divisors is an integer number (239374158).

Almost surely, 2^638331086 is an apocalyptic number.

638331086 is a deficient number, since it is larger than the sum of its proper divisors (319165546).

638331086 is a wasteful number, since it uses less digits than its factorization.

638331086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319165545.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 638331086 is about 25265.2149407045. The cubic root of 638331086 is about 861.0241476562.

The spelling of 638331086 in words is "six hundred thirty-eight million, three hundred thirty-one thousand, eighty-six".