155161728 has 72 divisors (see below), whose sum is σ = 447713955. Its totient is φ = 51579648.

The previous prime is 155161667. The next prime is 155161739. The reversal of 155161728 is 827161551.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

155161728 is a `hidden beast` number, since 15 + 5 + 1 + 617 + 28 = 666.

It can be written as a sum of positive squares in only one way, i.e., 77580864 + 77580864 = 8808^2 + 8808^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=8808.

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

It is a junction number, because it is equal to n+sod(n) for n = 155161692 and 155161701.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 422601 + ... + 422967.

Almost surely, 2^155161728 is an apocalyptic number.

155161728 is a gapful number since it is divisible by the number (18) 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 155161728

155161728 is an abundant number, since it is smaller than the sum of its proper divisors (292552227).

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

155161728 is an frugal number, since it uses more digits than its factorization.

155161728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754 (or 372 counting only the distinct ones).

The product of its digits is 16800, while the sum is 36.

The square root of 155161728 is about 12456.3930573822. The cubic root of 155161728 is about 537.3552989247.

The spelling of 155161728 in words is "one hundred fifty-five million, one hundred sixty-one thousand, seven hundred twenty-eight".