215205500 has 24 divisors (see below), whose sum is σ = 470009904. Its totient is φ = 86082000.

The previous prime is 215205467. The next prime is 215205511. The reversal of 215205500 is 5502512.

It is a hoax number, since the sum of its digits (20) 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 (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214706 + ... + 215705.

It is an arithmetic number, because the mean of its divisors is an integer number (19583746).

Almost surely, 2^215205500 is an apocalyptic number.

215205500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215205500 is an abundant number, since it is smaller than the sum of its proper divisors (254804404).

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

215205500 is a wasteful number, since it uses less digits than its factorization.

215205500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430430 (or 430418 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 215205500 is about 14669.8841167884. The cubic root of 215205500 is about 599.2634480405.

The spelling of 215205500 in words is "two hundred fifteen million, two hundred five thousand, five hundred".