256842707 has 6 divisors (see below), whose sum is σ = 282314844. Its totient is φ = 233493260.

The previous prime is 256842673. The next prime is 256842721. The reversal of 256842707 is 707248652.

It is a de Polignac number, because none of the positive numbers 2^k-256842707 is a prime.

It is a super-2 number, since 2×256842707² = 131936352278175698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256842767) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1061213 + ... + 1061454.

It is an arithmetic number, because the mean of its divisors is an integer number (47052474).

Almost surely, 2^256842707 is an apocalyptic number.

256842707 is a deficient number, since it is larger than the sum of its proper divisors (25472137).

256842707 is a wasteful number, since it uses less digits than its factorization.

256842707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122689 (or 2122678 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 41.

The square root of 256842707 is about 16026.3129571340. The cubic root of 256842707 is about 635.6563837128.

The spelling of 256842707 in words is "two hundred fifty-six million, eight hundred forty-two thousand, seven hundred seven".