155224520 has 64 divisors (see below), whose sum is σ = 384056640. Its totient is φ = 55993600.

The previous prime is 155224507. The next prime is 155224523. The reversal of 155224520 is 25422551.

It is a self number, because there is not a number n which added to its sum of digits gives 155224520.

It is not an unprimeable number, because it can be changed into a prime (155224523) 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, 56294 + ... + 58986.

It is an arithmetic number, because the mean of its divisors is an integer number (6000885).

Almost surely, 2^155224520 is an apocalyptic number.

155224520 is a gapful number since it is divisible by the number (10) 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 155224520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192028320).

155224520 is an abundant number, since it is smaller than the sum of its proper divisors (228832120).

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

155224520 is a wasteful number, since it uses less digits than its factorization.

155224520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2846 (or 2842 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 155224520 is about 12458.9132752419. The cubic root of 155224520 is about 537.4277761259.

The spelling of 155224520 in words is "one hundred fifty-five million, two hundred twenty-four thousand, five hundred twenty".