15881040400 has 45 divisors (see below), whose sum is σ = 38160255783. Its totient is φ = 6351408000.

The previous prime is 15881040397. The next prime is 15881040421. The reversal of 15881040400 is 404018851.

The square root of 15881040400 is 126020.

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 9072144 + 15871968256 = 3012^2 + 125984^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2517250 + ... + 2523550.

Almost surely, 2^15881040400 is an apocalyptic number.

15881040400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15881040400 is the 126020-th square number.

It is an amenable number.

15881040400 is an abundant number, since it is smaller than the sum of its proper divisors (22279215383).

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

15881040400 is an frugal number, since it uses more digits than its factorization.

15881040400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12620 (or 6308 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 31.

The spelling of 15881040400 in words is "fifteen billion, eight hundred eighty-one million, forty thousand, four hundred".