256778704 has 80 divisors (see below), whose sum is σ = 632181760. Its totient is φ = 98288640.

The previous prime is 256778593. The next prime is 256778713. The reversal of 256778704 is 407877652.

It is a congruent number.

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, 42292 + ... + 47980.

It is an arithmetic number, because the mean of its divisors is an integer number (7902272).

Almost surely, 2^256778704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256778704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (316090880).

256778704 is an abundant number, since it is smaller than the sum of its proper divisors (375403056).

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

256778704 is a wasteful number, since it uses less digits than its factorization.

256778704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5748 (or 5742 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 46.

The square root of 256778704 is about 16024.3160228448. The cubic root of 256778704 is about 635.6035792865.

The spelling of 256778704 in words is "two hundred fifty-six million, seven hundred seventy-eight thousand, seven hundred four".