215865080 has 64 divisors (see below), whose sum is σ = 513216000. Its totient is φ = 81489024.

The previous prime is 215865079. The next prime is 215865103. The reversal of 215865080 is 80568512.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 215865080.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 333317 + ... + 333963.

It is an arithmetic number, because the mean of its divisors is an integer number (8019000).

Almost surely, 2^215865080 is an apocalyptic number.

215865080 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 215865080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256608000).

215865080 is an abundant number, since it is smaller than the sum of its proper divisors (297350920).

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

215865080 is a wasteful number, since it uses less digits than its factorization.

215865080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116 (or 1112 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 215865080 is about 14692.3476680890. The cubic root of 215865080 is about 599.8750480542.

The spelling of 215865080 in words is "two hundred fifteen million, eight hundred sixty-five thousand, eighty".