256431026 has 16 divisors (see below), whose sum is σ = 409532760. Its totient is φ = 120003840.

The previous prime is 256431023. The next prime is 256431029. The reversal of 256431026 is 620134652.

It is an interprime number because it is at equal distance from previous prime (256431023) and next prime (256431029).

It can be written as a sum of positive squares in 4 ways, for example, as 129846025 + 126585001 = 11395^2 + 11251^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 256431026.

It is not an unprimeable number, because it can be changed into a prime (256431023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14681 + ... + 26988.

Almost surely, 2^256431026 is an apocalyptic number.

256431026 is a deficient number, since it is larger than the sum of its proper divisors (153101734).

256431026 is a wasteful number, since it uses less digits than its factorization.

256431026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41869.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 256431026 is about 16013.4638976082. The cubic root of 256431026 is about 635.3165809350.

Adding to 256431026 its reverse (620134652), we get a palindrome (876565678).

The spelling of 256431026 in words is "two hundred fifty-six million, four hundred thirty-one thousand, twenty-six".