215256490 has 16 divisors (see below), whose sum is σ = 388906920. Its totient is φ = 85781440.

The previous prime is 215256443. The next prime is 215256493. The reversal of 215256490 is 94652512.

It is a happy number.

215256490 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 53890281 + 161366209 = 7341^2 + 12703^2 .

It is not an unprimeable number, because it can be changed into a prime (215256493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37321 + ... + 42700.

Almost surely, 2^215256490 is an apocalyptic number.

215256490 is a deficient number, since it is larger than the sum of its proper divisors (173650430).

215256490 is a wasteful number, since it uses less digits than its factorization.

215256490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80297.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 215256490 is about 14671.6219280624. The cubic root of 215256490 is about 599.3107733958.

The spelling of 215256490 in words is "two hundred fifteen million, two hundred fifty-six thousand, four hundred ninety".