781342256 has 20 divisors (see below), whose sum is σ = 1514771352. Its totient is φ = 390433536.

The previous prime is 781342201. The next prime is 781342267. The reversal of 781342256 is 652243187.

It is a happy number.

It is a super-2 number, since 2×781342256² = 1220991442022339072, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 13976 + ... + 41928.

Almost surely, 2^781342256 is an apocalyptic number.

It is a pronic number, being equal to 27952×27953.

It is an amenable number.

781342256 is a deficient number, since it is larger than the sum of its proper divisors (733429096).

781342256 is a wasteful number, since it uses less digits than its factorization.

781342256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29708 (or 29702 counting only the distinct ones).

The product of its digits is 80640, while the sum is 38.

The square root of 781342256 is about 27952.4999955281. The cubic root of 781342256 is about 921.0441264609.

The spelling of 781342256 in words is "seven hundred eighty-one million, three hundred forty-two thousand, two hundred fifty-six".