256781492 has 48 divisors (see below), whose sum is σ = 503774208. Its totient is φ = 113524320.

The previous prime is 256781479. The next prime is 256781501. The reversal of 256781492 is 294187652.

It is a happy number.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 469163 + ... + 469709.

It is an arithmetic number, because the mean of its divisors is an integer number (10495296).

Almost surely, 2^256781492 is an apocalyptic number.

256781492 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

256781492 is a deficient number, since it is larger than the sum of its proper divisors (246992716).

256781492 is a wasteful number, since it uses less digits than its factorization.

256781492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836 (or 834 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 256781492 is about 16024.4030154012. The cubic root of 256781492 is about 635.6058796543.

The spelling of 256781492 in words is "two hundred fifty-six million, seven hundred eighty-one thousand, four hundred ninety-two".