215790564 has 48 divisors (see below), whose sum is σ = 551509056. Its totient is φ = 65126400.

The previous prime is 215790559. The next prime is 215790569. The reversal of 215790564 is 465097512.

It is an interprime number because it is at equal distance from previous prime (215790559) and next prime (215790569).

It is a super-2 number, since 2×215790564² = 93131135022876192, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (215790569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30744 + ... + 37104.

It is an arithmetic number, because the mean of its divisors is an integer number (11489772).

Almost surely, 2^215790564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215790564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275754528).

215790564 is an abundant number, since it is smaller than the sum of its proper divisors (335718492).

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

215790564 is a wasteful number, since it uses less digits than its factorization.

215790564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6636 (or 6634 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 215790564 is about 14689.8115712898. The cubic root of 215790564 is about 599.8060150676.

The spelling of 215790564 in words is "two hundred fifteen million, seven hundred ninety thousand, five hundred sixty-four".