155280000 has 160 divisors (see below), whose sum is σ = 516209760. Its totient is φ = 41344000.

The previous prime is 155279987. The next prime is 155280017. The reversal of 155280000 is 82551.

It is a tau number, because it is divible by the number of its divisors (160).

It is a super-2 number, since 2×155280000² = 48223756800000000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 239677 + ... + 240323.

It is an arithmetic number, because the mean of its divisors is an integer number (3226311).

Almost surely, 2^155280000 is an apocalyptic number.

155280000 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 155280000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258104880).

155280000 is an abundant number, since it is smaller than the sum of its proper divisors (360929760).

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

155280000 is an frugal number, since it uses more digits than its factorization.

155280000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 155280000 is about 12461.1395947562. The cubic root of 155280000 is about 537.4917972428.

The spelling of 155280000 in words is "one hundred fifty-five million, two hundred eighty thousand".