102815139904 has 63 divisors (see below), whose sum is σ = 206168686087. Its totient is φ = 50872729088.

The previous prime is 102815139887. The next prime is 102815139913. The reversal of 102815139904 is 409931518201.

The square root of 102815139904 is 320648.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 69194250304 + 33620889600 = 263048^2 + 183360^2 .

It is a Duffinian 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 8 ways as a sum of consecutive naturals, for example, 382212282 + ... + 382212550.

Almost surely, 2^102815139904 is an apocalyptic number.

102815139904 is the 320648-th square number.

It is an amenable number.

102815139904 is an abundant number, since it is smaller than the sum of its proper divisors (103353546183).

102815139904 is an frugal number, since it uses more digits than its factorization.

102815139904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The spelling of 102815139904 in words is "one hundred two billion, eight hundred fifteen million, one hundred thirty-nine thousand, nine hundred four".