215561364 has 48 divisors (see below), whose sum is σ = 516230400. Its totient is φ = 69975936.

The previous prime is 215561351. The next prime is 215561369. The reversal of 215561364 is 463165512.

215561364 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215561369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128322 + ... + 129990.

It is an arithmetic number, because the mean of its divisors is an integer number (10754800).

Almost surely, 2^215561364 is an apocalyptic number.

It is an amenable number.

215561364 is an abundant number, since it is smaller than the sum of its proper divisors (300669036).

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

215561364 is a wasteful number, since it uses less digits than its factorization.

215561364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1952 (or 1950 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 215561364 is about 14682.0081732711. The cubic root of 215561364 is about 599.5935803228.

The spelling of 215561364 in words is "two hundred fifteen million, five hundred sixty-one thousand, three hundred sixty-four".