256747706 has 4 divisors (see below), whose sum is σ = 385121562. Its totient is φ = 128373852.

The previous prime is 256747693. The next prime is 256747717. The reversal of 256747706 is 607747652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 181144681 + 75603025 = 13459^2 + 8695^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64186925 + ... + 64186928.

Almost surely, 2^256747706 is an apocalyptic number.

256747706 is a deficient number, since it is larger than the sum of its proper divisors (128373856).

256747706 is a wasteful number, since it uses less digits than its factorization.

256747706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128373855.

The product of its (nonzero) digits is 493920, while the sum is 44.

The square root of 256747706 is about 16023.3487760830. The cubic root of 256747706 is about 635.5780018375.

The spelling of 256747706 in words is "two hundred fifty-six million, seven hundred forty-seven thousand, seven hundred six".