638360780 has 12 divisors (see below), whose sum is σ = 1340557680. Its totient is φ = 255344304.

The previous prime is 638360771. The next prime is 638360797. The reversal of 638360780 is 87063836.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15959000 + ... + 15959039.

It is an arithmetic number, because the mean of its divisors is an integer number (111713140).

Almost surely, 2^638360780 is an apocalyptic number.

It is an amenable number.

638360780 is an abundant number, since it is smaller than the sum of its proper divisors (702196900).

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

638360780 is a wasteful number, since it uses less digits than its factorization.

638360780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31918048 (or 31918046 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 638360780 is about 25265.8025797717. The cubic root of 638360780 is about 861.0374985411.

The spelling of 638360780 in words is "six hundred thirty-eight million, three hundred sixty thousand, seven hundred eighty".