155825280 has 192 divisors, whose sum is σ = 579753720. Its totient is φ = 38338560.

The previous prime is 155825269. The next prime is 155825287. The reversal of 155825280 is 82528551.

155825280 is a `hidden beast` number, since 1 + 55 + 82 + 528 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 88059456 + 67765824 = 9384^2 + 8232^2 .

It is a tau number, because it is divible by the number of its divisors (192).

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

It is a zygodrome in base 8 and base 12.

It is not an unprimeable number, because it can be changed into a prime (155825287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73840 + ... + 75920.

Almost surely, 2^155825280 is an apocalyptic number.

155825280 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 155825280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289876860).

155825280 is an abundant number, since it is smaller than the sum of its proper divisors (423928440).

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

155825280 is a wasteful number, since it uses less digits than its factorization.

155825280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2119 (or 2104 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 36.

The square root of 155825280 is about 12482.9996395097. Note that the first 3 decimals coincide. The cubic root of 155825280 is about 538.1202128611.

The spelling of 155825280 in words is "one hundred fifty-five million, eight hundred twenty-five thousand, two hundred eighty".