155138580 has 36 divisors (see below), whose sum is σ = 470587572. Its totient is φ = 41370240.

The previous prime is 155138563. The next prime is 155138593. The reversal of 155138580 is 85831551.

155138580 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 20903184 + 134235396 = 4572^2 + 11586^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 430761 + ... + 431120.

It is an arithmetic number, because the mean of its divisors is an integer number (13071877).

Almost surely, 2^155138580 is an apocalyptic number.

155138580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155138580 is an abundant number, since it is smaller than the sum of its proper divisors (315448992).

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

155138580 is a wasteful number, since it uses less digits than its factorization.

155138580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861896 (or 861891 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 36.

The square root of 155138580 is about 12455.4638612940. The cubic root of 155138580 is about 537.3285755842.

The spelling of 155138580 in words is "one hundred fifty-five million, one hundred thirty-eight thousand, five hundred eighty".