256720922 has 8 divisors (see below), whose sum is σ = 394036896. Its totient is φ = 125375292.

The previous prime is 256720901. The next prime is 256720931. The reversal of 256720922 is 229027652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1492478 + ... + 1492649.

It is an arithmetic number, because the mean of its divisors is an integer number (49254612).

Almost surely, 2^256720922 is an apocalyptic number.

256720922 is a deficient number, since it is larger than the sum of its proper divisors (137315974).

256720922 is a wasteful number, since it uses less digits than its factorization.

256720922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2985172.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 256720922 is about 16022.5129739376. The cubic root of 256720922 is about 635.5558998378. Note that the first 3 decimals are identical.

The spelling of 256720922 in words is "two hundred fifty-six million, seven hundred twenty thousand, nine hundred twenty-two".