215515560 has 96 divisors (see below), whose sum is σ = 700172640. Its totient is φ = 53044992.

The previous prime is 215515507. The next prime is 215515561. The reversal of 215515560 is 65515512.

It is a super-2 number, since 2×215515560² = 92893913204227200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

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 (215515561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14967 + ... + 25593.

It is an arithmetic number, because the mean of its divisors is an integer number (7293465).

Almost surely, 2^215515560 is an apocalyptic number.

215515560 is a gapful number since it is divisible by the number (20) 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 215515560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (350086320).

215515560 is an abundant number, since it is smaller than the sum of its proper divisors (484657080).

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

215515560 is a wasteful number, since it uses less digits than its factorization.

215515560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10667 (or 10650 counting only the distinct ones).

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

The square root of 215515560 is about 14680.4482220401. The cubic root of 215515560 is about 599.5511086892.

The spelling of 215515560 in words is "two hundred fifteen million, five hundred fifteen thousand, five hundred sixty".