256734506 has 16 divisors (see below), whose sum is σ = 455293440. Its totient is φ = 106234800.

The previous prime is 256734481. The next prime is 256734557. The reversal of 256734506 is 605437652.

It is a self number, because there is not a number n which added to its sum of digits gives 256734506.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315770 + ... + 316581.

It is an arithmetic number, because the mean of its divisors is an integer number (28455840).

Almost surely, 2^256734506 is an apocalyptic number.

256734506 is a deficient number, since it is larger than the sum of its proper divisors (198558934).

256734506 is a wasteful number, since it uses less digits than its factorization.

256734506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632389.

The product of its (nonzero) digits is 151200, while the sum is 38.

The square root of 256734506 is about 16022.9368718721. The cubic root of 256734506 is about 635.5671094671.

It can be divided in two parts, 2567 and 34506, that added together give a palindrome (37073).

The spelling of 256734506 in words is "two hundred fifty-six million, seven hundred thirty-four thousand, five hundred six".