215415264 has 24 divisors (see below), whose sum is σ = 565465320. Its totient is φ = 71805056.

The previous prime is 215415253. The next prime is 215415323. The reversal of 215415264 is 462514512.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1121859 + ... + 1122050.

It is an arithmetic number, because the mean of its divisors is an integer number (23561055).

Almost surely, 2^215415264 is an apocalyptic number.

215415264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

215415264 is an abundant number, since it is smaller than the sum of its proper divisors (350050056).

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

215415264 is a wasteful number, since it uses less digits than its factorization.

215415264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2243922 (or 2243914 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The square root of 215415264 is about 14677.0318525239. The cubic root of 215415264 is about 599.4580884783.

Adding to 215415264 its reverse (462514512), we get a palindrome (677929776).

The spelling of 215415264 in words is "two hundred fifteen million, four hundred fifteen thousand, two hundred sixty-four".