155278080 has 144 divisors (see below), whose sum is σ = 551144160. Its totient is φ = 41398272.

The previous prime is 155278063. The next prime is 155278087. The reversal of 155278080 is 80872551.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×155278080² = 48222564256972800, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (155278087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32314 + ... + 36806.

It is an arithmetic number, because the mean of its divisors is an integer number (3827390).

Almost surely, 2^155278080 is an apocalyptic number.

155278080 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 155278080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275572080).

155278080 is an abundant number, since it is smaller than the sum of its proper divisors (395866080).

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

155278080 is an equidigital number, since it uses as much as digits as its factorization.

155278080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4523 (or 4503 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 155278080 is about 12461.0625550151. The cubic root of 155278080 is about 537.4895819145.

The spelling of 155278080 in words is "one hundred fifty-five million, two hundred seventy-eight thousand, eighty".