155515272 has 64 divisors (see below), whose sum is σ = 425390400. Its totient is φ = 46986240.

The previous prime is 155515267. The next prime is 155515273. The reversal of 155515272 is 272515551.

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 (155515273) 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, 120004 + ... + 121292.

It is an arithmetic number, because the mean of its divisors is an integer number (6646725).

Almost surely, 2^155515272 is an apocalyptic number.

155515272 is a gapful number since it is divisible by the number (12) 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 155515272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212695200).

155515272 is an abundant number, since it is smaller than the sum of its proper divisors (269875128).

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

155515272 is a wasteful number, since it uses less digits than its factorization.

155515272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766 (or 1762 counting only the distinct ones).

The product of its digits is 17500, while the sum is 33.

The square root of 155515272 is about 12470.5762497168. The cubic root of 155515272 is about 537.7631199222.

The spelling of 155515272 in words is "one hundred fifty-five million, five hundred fifteen thousand, two hundred seventy-two".