256720798 has 8 divisors (see below), whose sum is σ = 386734608. Its totient is φ = 127809264.

The previous prime is 256720787. The next prime is 256720801. The reversal of 256720798 is 897027652.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274986 + ... + 275917.

It is an arithmetic number, because the mean of its divisors is an integer number (48341826).

Almost surely, 2^256720798 is an apocalyptic number.

256720798 is a deficient number, since it is larger than the sum of its proper divisors (130013810).

256720798 is a wasteful number, since it uses less digits than its factorization.

256720798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551138.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 256720798 is about 16022.5091043819. The cubic root of 256720798 is about 635.5557975102. Note that the first 3 decimals are identical.

The spelling of 256720798 in words is "two hundred fifty-six million, seven hundred twenty thousand, seven hundred ninety-eight".