155580 has 24 divisors (see below), whose sum is σ = 435792. Its totient is φ = 41472.

The previous prime is 155579. The next prime is 155581. The reversal of 155580 is 85551.

It is an interprime number because it is at equal distance from previous prime (155579) and next prime (155581).

It is a super-3 number, since 3×155580³ = 11297505363336000, which contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 155580.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155581) 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, 1237 + ... + 1356.

It is an arithmetic number, because the mean of its divisors is an integer number (18158).

2¹⁵⁵⁵⁸⁰ is an apocalyptic number.

155580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155580 is an abundant number, since it is smaller than the sum of its proper divisors (280212).

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

155580 is a wasteful number, since it uses less digits than its factorization.

155580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2605 (or 2603 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 155580 is about 394.4363066453. The cubic root of 155580 is about 53.7837718176.

The spelling of 155580 in words is "one hundred fifty-five thousand, five hundred eighty".