215606420 has 12 divisors (see below), whose sum is σ = 452773524. Its totient is φ = 86242560.

The previous prime is 215606411. The next prime is 215606431. The reversal of 215606420 is 24606512.

215606420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 51868804 + 163737616 = 7202^2 + 12796^2 .

It is a super-2 number, since 2×215606420² = 92972256690432800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 215606420.

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, 5390141 + ... + 5390180.

It is an arithmetic number, because the mean of its divisors is an integer number (37731127).

Almost surely, 2^215606420 is an apocalyptic number.

215606420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215606420 is an abundant number, since it is smaller than the sum of its proper divisors (237167104).

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

215606420 is a wasteful number, since it uses less digits than its factorization.

215606420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10780330 (or 10780328 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 215606420 is about 14683.5424881055. The cubic root of 215606420 is about 599.6353525060.

The spelling of 215606420 in words is "two hundred fifteen million, six hundred six thousand, four hundred twenty".