155402880 has 128 divisors (see below), whose sum is σ = 512611200. Its totient is φ = 39997440.

The previous prime is 155402879. The next prime is 155402893. The reversal of 155402880 is 88204551.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×155402880² = 48300110224588800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54285 + ... + 57075.

It is an arithmetic number, because the mean of its divisors is an integer number (4004775).

Almost surely, 2^155402880 is an apocalyptic number.

155402880 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 155402880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256305600).

155402880 is an abundant number, since it is smaller than the sum of its proper divisors (357208320).

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

155402880 is a wasteful number, since it uses less digits than its factorization.

155402880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2842 (or 2830 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 155402880 is about 12466.0691478910. The cubic root of 155402880 is about 537.6335402827.

The spelling of 155402880 in words is "one hundred fifty-five million, four hundred two thousand, eight hundred eighty".