256730215 has 32 divisors (see below), whose sum is σ = 361635840. Its totient is φ = 171314304.

The previous prime is 256730137. The next prime is 256730231. The reversal of 256730215 is 512037652.

It is not a de Polignac number, because 256730215 - 2²⁷ = 122512487 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 392829 + ... + 393481.

It is an arithmetic number, because the mean of its divisors is an integer number (11301120).

Almost surely, 2^256730215 is an apocalyptic number.

256730215 is a deficient number, since it is larger than the sum of its proper divisors (104905625).

256730215 is a wasteful number, since it uses less digits than its factorization.

256730215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 256730215 is about 16022.8029695182. The cubic root of 256730215 is about 635.5635685411.

Adding to 256730215 its reverse (512037652), we get a palindrome (768767867).

The spelling of 256730215 in words is "two hundred fifty-six million, seven hundred thirty thousand, two hundred fifteen".