155801880 has 256 divisors, whose sum is σ = 570326400. Its totient is φ = 38071296.

The previous prime is 155801879. The next prime is 155801909. The reversal of 155801880 is 88108551.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1137172 + ... + 1137308.

Almost surely, 2^155801880 is an apocalyptic number.

155801880 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 155801880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285163200).

155801880 is an abundant number, since it is smaller than the sum of its proper divisors (414524520).

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

155801880 is a wasteful number, since it uses less digits than its factorization.

155801880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 36.

The square root of 155801880 is about 12482.0623295992. The cubic root of 155801880 is about 538.0932753335.

The spelling of 155801880 in words is "one hundred fifty-five million, eight hundred one thousand, eight hundred eighty".