639788094 has 48 divisors (see below), whose sum is σ = 1537885440. Its totient is φ = 190585680.

The previous prime is 639788077. The next prime is 639788113. The reversal of 639788094 is 490887936.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 639788094.

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 23 ways as a sum of consecutive naturals, for example, 15702 + ... + 39065.

It is an arithmetic number, because the mean of its divisors is an integer number (32039280).

Almost surely, 2^639788094 is an apocalyptic number.

639788094 is an abundant number, since it is smaller than the sum of its proper divisors (898097346).

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

639788094 is a wasteful number, since it uses less digits than its factorization.

639788094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54845 (or 54842 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 639788094 is about 25294.0327745498. The cubic root of 639788094 is about 861.6787535057.

The spelling of 639788094 in words is "six hundred thirty-nine million, seven hundred eighty-eight thousand, ninety-four".