155155428 has 18 divisors (see below), whose sum is σ = 392198534. Its totient is φ = 51718464.

The previous prime is 155155421. The next prime is 155155453. The reversal of 155155428 is 824551551.

It can be written as a sum of positive squares in only one way, i.e., 154703844 + 451584 = 12438^2 + 672^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 4309873 = 155155428 / (1 + 5 + 5 + 1 + 5 + 5 + 4 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 155155392 and 155155401.

It is not an unprimeable number, because it can be changed into a prime (155155421) 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, 2154901 + ... + 2154972.

Almost surely, 2^155155428 is an apocalyptic number.

155155428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

155155428 is an abundant number, since it is smaller than the sum of its proper divisors (237043106).

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

155155428 is a wasteful number, since it uses less digits than its factorization.

155155428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4309883 (or 4309878 counting only the distinct ones).

The product of its digits is 40000, while the sum is 36.

The square root of 155155428 is about 12456.1401726217. The cubic root of 155155428 is about 537.3480261170.

It can be divided in two parts, 1551 and 55428, that multiplied together give a triangular number (85968828 = T₁₃₁₁₂).

The spelling of 155155428 in words is "one hundred fifty-five million, one hundred fifty-five thousand, four hundred twenty-eight".