215268804 has 18 divisors (see below), whose sum is σ = 544151790. Its totient is φ = 71756256.

The previous prime is 215268731. The next prime is 215268811. The reversal of 215268804 is 408862512.

It can be written as a sum of positive squares in only one way, i.e., 133402500 + 81866304 = 11550^2 + 9048^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 5979689 = 215268804 / (2 + 1 + 5 + 2 + 6 + 8 + 8 + 0 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2989809 + ... + 2989880.

It is an arithmetic number, because the mean of its divisors is an integer number (30230655).

Almost surely, 2^215268804 is an apocalyptic number.

It is an amenable number.

215268804 is an abundant number, since it is smaller than the sum of its proper divisors (328882986).

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

215268804 is a wasteful number, since it uses less digits than its factorization.

215268804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5979699 (or 5979694 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 215268804 is about 14672.0415757317. The cubic root of 215268804 is about 599.3222012698.

The spelling of 215268804 in words is "two hundred fifteen million, two hundred sixty-eight thousand, eight hundred four".