155215560 has 96 divisors (see below), whose sum is σ = 491581440. Its totient is φ = 39201408.

The previous prime is 155215553. The next prime is 155215589. The reversal of 155215560 is 65512551.

It is a super-2 number, since 2×155215560² = 48183740132227200, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41529 + ... + 45111.

It is an arithmetic number, because the mean of its divisors is an integer number (5120640).

Almost surely, 2^155215560 is an apocalyptic number.

155215560 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 155215560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245790720).

155215560 is an abundant number, since it is smaller than the sum of its proper divisors (336365880).

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

155215560 is a wasteful number, since it uses less digits than its factorization.

155215560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3635 (or 3612 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 155215560 is about 12458.5536881293. The cubic root of 155215560 is about 537.4174353079.

The spelling of 155215560 in words is "one hundred fifty-five million, two hundred fifteen thousand, five hundred sixty".