215129880 has 96 divisors (see below), whose sum is σ = 799063200. Its totient is φ = 49171968.

The previous prime is 215129869. The next prime is 215129881. The reversal of 215129880 is 88921512.

215129880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215129881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40165 + ... + 45204.

It is an arithmetic number, because the mean of its divisors is an integer number (8323575).

Almost surely, 2^215129880 is an apocalyptic number.

215129880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215129880 is an abundant number, since it is smaller than the sum of its proper divisors (583933320).

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

215129880 is a wasteful number, since it uses less digits than its factorization.

215129880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85393 (or 85386 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 215129880 is about 14667.3065011951. The cubic root of 215129880 is about 599.1932490744.

The spelling of 215129880 in words is "two hundred fifteen million, one hundred twenty-nine thousand, eight hundred eighty".