215299980 has 72 divisors (see below), whose sum is σ = 746377632. Its totient is φ = 49211136.

The previous prime is 215299957. The next prime is 215299993. The reversal of 215299980 is 89992512.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 84177 + ... + 86696.

It is an arithmetic number, because the mean of its divisors is an integer number (10366356).

Almost surely, 2^215299980 is an apocalyptic number.

215299980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215299980 is an abundant number, since it is smaller than the sum of its proper divisors (531077652).

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

215299980 is a wasteful number, since it uses less digits than its factorization.

215299980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170895 (or 170890 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 215299980 is about 14673.1039661007. The cubic root of 215299980 is about 599.3511318699.

The spelling of 215299980 in words is "two hundred fifteen million, two hundred ninety-nine thousand, nine hundred eighty".