256975890 has 32 divisors (see below), whose sum is σ = 619318656. Its totient is φ = 68240640.

The previous prime is 256975889. The next prime is 256975891. The reversal of 256975890 is 98579652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (256975889) and next prime (256975891).

It is not an unprimeable number, because it can be changed into a prime (256975891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10542 + ... + 25001.

It is an arithmetic number, because the mean of its divisors is an integer number (19353708).

Almost surely, 2^256975890 is an apocalyptic number.

256975890 is an abundant number, since it is smaller than the sum of its proper divisors (362342766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256975890 is a wasteful number, since it uses less digits than its factorization.

256975890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35794.

The product of its (nonzero) digits is 1360800, while the sum is 51.

The square root of 256975890 is about 16030.4675540048. The cubic root of 256975890 is about 635.7662356353.

The spelling of 256975890 in words is "two hundred fifty-six million, nine hundred seventy-five thousand, eight hundred ninety".