840072256 has 21 divisors (see below), whose sum is σ = 1667478631. Its totient is φ = 419920192.

The previous prime is 840072253. The next prime is 840072269. The reversal of 840072256 is 652270048.

The square root of 840072256 is 28984.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840072253) 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 2 ways as a sum of consecutive naturals, for example, 230061 + ... + 233683.

Almost surely, 2^840072256 is an apocalyptic number.

840072256 is the 28984-th square number.

It is an amenable number.

840072256 is a deficient number, since it is larger than the sum of its proper divisors (827406375).

840072256 is an frugal number, since it uses more digits than its factorization.

840072256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7258 (or 3625 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The cubic root of 840072256 is about 943.5658493905.

It can be divided in two parts, 8400 and 72256, that added together give a square (80656 = 284²).

The spelling of 840072256 in words is "eight hundred forty million, seventy-two thousand, two hundred fifty-six".