155680 has 48 divisors (see below), whose sum is σ = 423360. Its totient is φ = 52992.

The previous prime is 155671. The next prime is 155689. The reversal of 155680 is 86551.

It is an interprime number because it is at equal distance from previous prime (155671) and next prime (155689).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155689) by changing a digit.

155680 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1051 + ... + 1189.

It is an arithmetic number, because the mean of its divisors is an integer number (8820).

2¹⁵⁵⁶⁸⁰ is an apocalyptic number.

155680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211680).

155680 is an abundant number, since it is smaller than the sum of its proper divisors (267680).

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

155680 is a wasteful number, since it uses less digits than its factorization.

155680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 155680 is about 394.5630494610. The cubic root of 155680 is about 53.7952926327.

The spelling of 155680 in words is "one hundred fifty-five thousand, six hundred eighty".