256740195 has 16 divisors (see below), whose sum is σ = 411311520. Its totient is φ = 136752384.

The previous prime is 256740193. The next prime is 256740199. The reversal of 256740195 is 591047652.

It is not a de Polignac number, because 256740195 - 2¹ = 256740193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256740193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1557 + ... + 22713.

It is an arithmetic number, because the mean of its divisors is an integer number (25706970).

Almost surely, 2^256740195 is an apocalyptic number.

256740195 is a deficient number, since it is larger than the sum of its proper divisors (154571325).

256740195 is a wasteful number, since it uses less digits than its factorization.

256740195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21974.

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 256740195 is about 16023.1143976444. The cubic root of 256740195 is about 635.5718039595.

The spelling of 256740195 in words is "two hundred fifty-six million, seven hundred forty thousand, one hundred ninety-five".