256802547 has 4 divisors (see below), whose sum is σ = 342403400. Its totient is φ = 171201696.

The previous prime is 256802531. The next prime is 256802551. The reversal of 256802547 is 745208652.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 256802547 - 2⁴ = 256802531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256802597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42800422 + ... + 42800427.

It is an arithmetic number, because the mean of its divisors is an integer number (85600850).

Almost surely, 2^256802547 is an apocalyptic number.

256802547 is a deficient number, since it is larger than the sum of its proper divisors (85600853).

256802547 is an equidigital number, since it uses as much as digits as its factorization.

256802547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85600852.

The product of its (nonzero) digits is 134400, while the sum is 39.

The square root of 256802547 is about 16025.0599686865. The cubic root of 256802547 is about 635.6232515139.

The spelling of 256802547 in words is "two hundred fifty-six million, eight hundred two thousand, five hundred forty-seven".