215881036900 has 81 divisors (see below), whose sum is σ = 474331391499. Its totient is φ = 85283765760.

The previous prime is 215881036879. The next prime is 215881036939. The reversal of 215881036900 is 9630188512.

The square root of 215881036900 is 464630.

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 7937740836 + 207943296064 = 89094^2 + 456008^2 .

It is a super-2 number, since 2×215881036900² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 450690861 + ... + 450691339.

Almost surely, 2^215881036900 is an apocalyptic number.

215881036900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

215881036900 is the 464630-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215881036900

215881036900 is an abundant number, since it is smaller than the sum of its proper divisors (258450354599).

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

215881036900 is an frugal number, since it uses more digits than its factorization.

215881036900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166 (or 583 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The spelling of 215881036900 in words is "two hundred fifteen billion, eight hundred eighty-one million, thirty-six thousand, nine hundred".