155539728 has 30 divisors (see below), whose sum is σ = 435295614. Its totient is φ = 51846528.

The previous prime is 155539721. The next prime is 155539733. The reversal of 155539728 is 827935551.

155539728 is a `hidden beast` number, since 1 + 5 + 553 + 97 + 2 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 120824064 + 34715664 = 10992^2 + 5892^2 .

It is not an unprimeable number, because it can be changed into a prime (155539721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 539925 + ... + 540212.

Almost surely, 2^155539728 is an apocalyptic number.

155539728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

155539728 is an abundant number, since it is smaller than the sum of its proper divisors (279755886).

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

155539728 is a wasteful number, since it uses less digits than its factorization.

155539728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080151 (or 1080142 counting only the distinct ones).

The product of its digits is 378000, while the sum is 45.

The square root of 155539728 is about 12471.5567592823. The cubic root of 155539728 is about 537.7913076051.

It can be divided in two parts, 15553 and 9728, that added together give a square (25281 = 159²).

The spelling of 155539728 in words is "one hundred fifty-five million, five hundred thirty-nine thousand, seven hundred twenty-eight".