215580 has 24 divisors (see below), whose sum is σ = 603792. Its totient is φ = 57472.

The previous prime is 215573. The next prime is 215587. The reversal of 215580 is 85512.

215580 = 53² + 54² + ... + 92².

It is an interprime number because it is at equal distance from previous prime (215573) and next prime (215587).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1737 + ... + 1856.

It is an arithmetic number, because the mean of its divisors is an integer number (25158).

2²¹⁵⁵⁸⁰ is an apocalyptic number.

215580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215580 is an abundant number, since it is smaller than the sum of its proper divisors (388212).

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

215580 is a wasteful number, since it uses less digits than its factorization.

215580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3605 (or 3603 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 215580 is about 464.3059336257. The cubic root of 215580 is about 59.9610858781.

The spelling of 215580 in words is "two hundred fifteen thousand, five hundred eighty".