638920014 has 32 divisors (see below), whose sum is σ = 1286349984. Its totient is φ = 211560960.

The previous prime is 638919991. The next prime is 638920057. The reversal of 638920014 is 410029836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 978112 + ... + 978764.

It is an arithmetic number, because the mean of its divisors is an integer number (40198437).

Almost surely, 2^638920014 is an apocalyptic number.

638920014 is an abundant number, since it is smaller than the sum of its proper divisors (647429970).

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

638920014 is a wasteful number, since it uses less digits than its factorization.

638920014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 638920014 is about 25276.8671713882. The cubic root of 638920014 is about 861.2888615718.

The spelling of 638920014 in words is "six hundred thirty-eight million, nine hundred twenty thousand, fourteen".