155205988 has 24 divisors (see below), whose sum is σ = 328672512. Its totient is φ = 62603904.

The previous prime is 155205983. The next prime is 155205989. The reversal of 155205988 is 889502551.

It is a super-2 number, since 2×155205988² = 48177797422112288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155205983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162556 + ... + 163507.

It is an arithmetic number, because the mean of its divisors is an integer number (13694688).

Almost surely, 2^155205988 is an apocalyptic number.

It is an amenable number.

155205988 is an abundant number, since it is smaller than the sum of its proper divisors (173466524).

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

155205988 is a wasteful number, since it uses less digits than its factorization.

155205988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326091 (or 326089 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 43.

The square root of 155205988 is about 12458.1695284660. The cubic root of 155205988 is about 537.4063877354.

The spelling of 155205988 in words is "one hundred fifty-five million, two hundred five thousand, nine hundred eighty-eight".