215620 has 12 divisors (see below), whose sum is σ = 452844. Its totient is φ = 86240.

The previous prime is 215617. The next prime is 215653. The reversal of 215620 is 26512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 69696 + 145924 = 264^2 + 382^2 .

It is a junction number, because it is equal to n+sod(n) for n = 215594 and 215603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5371 + ... + 5410.

It is an arithmetic number, because the mean of its divisors is an integer number (37737).

2²¹⁵⁶²⁰ is an apocalyptic number.

215620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215620 is an abundant number, since it is smaller than the sum of its proper divisors (237224).

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

215620 is a wasteful number, since it uses less digits than its factorization.

215620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10790 (or 10788 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 215620 is about 464.3490066749. The cubic root of 215620 is about 59.9647941613.

The spelling of 215620 in words is "two hundred fifteen thousand, six hundred twenty".