256738404 has 48 divisors (see below), whose sum is σ = 665960960. Its totient is φ = 76446720.

The previous prime is 256738379. The next prime is 256738429. The reversal of 256738404 is 404837652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (256738379) and next prime (256738429).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21709 + ... + 31380.

Almost surely, 2^256738404 is an apocalyptic number.

It is an amenable number.

256738404 is an abundant number, since it is smaller than the sum of its proper divisors (409222556).

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

256738404 is a wasteful number, since it uses less digits than its factorization.

256738404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53140 (or 53138 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 39.

The square root of 256738404 is about 16023.0585095356. The cubic root of 256738404 is about 635.5703260559.

The spelling of 256738404 in words is "two hundred fifty-six million, seven hundred thirty-eight thousand, four hundred four".