215252720 has 20 divisors (see below), whose sum is σ = 500462760. Its totient is φ = 86101056.

The previous prime is 215252677. The next prime is 215252749. The reversal of 215252720 is 27252512.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 215252720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1345250 + ... + 1345409.

It is an arithmetic number, because the mean of its divisors is an integer number (25023138).

Almost surely, 2^215252720 is an apocalyptic number.

215252720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215252720 is an abundant number, since it is smaller than the sum of its proper divisors (285210040).

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

215252720 is a wasteful number, since it uses less digits than its factorization.

215252720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690672 (or 2690666 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 215252720 is about 14671.4934481804. The cubic root of 215252720 is about 599.3072746011.

It can be divided in two parts, 2152 and 52720, that added together give a cube (54872 = 38³).

The spelling of 215252720 in words is "two hundred fifteen million, two hundred fifty-two thousand, seven hundred twenty".