155185728 has 112 divisors (see below), whose sum is σ = 434522880. Its totient is φ = 48799744.

The previous prime is 155185727. The next prime is 155185739. The reversal of 155185728 is 827581551.

155185728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×155185728² = 48165220349779968, which contains 22 as substring.

It is a zygodrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 155185728.

It is not an unprimeable number, because it can be changed into a prime (155185727) 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, 261400 + ... + 261992.

Almost surely, 2^155185728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155185728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217261440).

155185728 is an abundant number, since it is smaller than the sum of its proper divisors (279337152).

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

155185728 is a wasteful number, since it uses less digits than its factorization.

155185728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684 (or 674 counting only the distinct ones).

The product of its digits is 112000, while the sum is 42.

The square root of 155185728 is about 12457.3563808699. The cubic root of 155185728 is about 537.3830030552.

The spelling of 155185728 in words is "one hundred fifty-five million, one hundred eighty-five thousand, seven hundred twenty-eight".