155228520 has 64 divisors (see below), whose sum is σ = 474491520. Its totient is φ = 40611584.

The previous prime is 155228483. The next prime is 155228527. The reversal of 155228520 is 25822551.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (155228527) 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, 5844 + ... + 18563.

It is an arithmetic number, because the mean of its divisors is an integer number (7413930).

Almost surely, 2^155228520 is an apocalyptic number.

155228520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155228520 is an abundant number, since it is smaller than the sum of its proper divisors (319263000).

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

155228520 is a wasteful number, since it uses less digits than its factorization.

155228520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24474 (or 24470 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 155228520 is about 12459.0738018522. The cubic root of 155228520 is about 537.4323924340.

It can be divided in two parts, 15522 and 8520, that added together give a palindrome (24042).

The spelling of 155228520 in words is "one hundred fifty-five million, two hundred twenty-eight thousand, five hundred twenty".