256906415 has 8 divisors (see below), whose sum is σ = 308395680. Its totient is φ = 205453152.

The previous prime is 256906399. The next prime is 256906453. The reversal of 256906415 is 514609652.

256906415 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256906415 - 2⁴ = 256906399 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10577 + ... + 25013.

It is an arithmetic number, because the mean of its divisors is an integer number (38549460).

Almost surely, 2^256906415 is an apocalyptic number.

256906415 is a deficient number, since it is larger than the sum of its proper divisors (51489265).

256906415 is a wasteful number, since it uses less digits than its factorization.

256906415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18001.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 256906415 is about 16028.3004401590. The cubic root of 256906415 is about 635.7089360441.

The spelling of 256906415 in words is "two hundred fifty-six million, nine hundred six thousand, four hundred fifteen".