155361228 has 96 divisors (see below), whose sum is σ = 418908672. Its totient is φ = 44352000.

The previous prime is 155361223. The next prime is 155361253. The reversal of 155361228 is 822163551.

155361228 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 2×155361228² = 48274222331335968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (155361221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 221278 + ... + 221978.

It is an arithmetic number, because the mean of its divisors is an integer number (4363632).

Almost surely, 2^155361228 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 155361228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209454336).

155361228 is an abundant number, since it is smaller than the sum of its proper divisors (263547444).

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

155361228 is a wasteful number, since it uses less digits than its factorization.

155361228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 813 counting only the distinct ones).

The product of its digits is 14400, while the sum is 33.

The square root of 155361228 is about 12464.3984211032. The cubic root of 155361228 is about 537.5855027491.

The spelling of 155361228 in words is "one hundred fifty-five million, three hundred sixty-one thousand, two hundred twenty-eight".