256634207 has 4 divisors (see below), whose sum is σ = 267792240. Its totient is φ = 245476176.

The previous prime is 256634179. The next prime is 256634219. The reversal of 256634207 is 702436652.

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

It is a cyclic number.

It is not a de Polignac number, because 256634207 - 2⁶ = 256634143 is a prime.

It is a super-2 number, since 2×256634207² = 131722232405037698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256634267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5578982 + ... + 5579027.

It is an arithmetic number, because the mean of its divisors is an integer number (66948060).

Almost surely, 2^256634207 is an apocalyptic number.

256634207 is a deficient number, since it is larger than the sum of its proper divisors (11158033).

256634207 is a wasteful number, since it uses less digits than its factorization.

256634207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11158032.

The product of its (nonzero) digits is 60480, while the sum is 35.

The square root of 256634207 is about 16019.8067091960. The cubic root of 256634207 is about 635.4843325812.

The spelling of 256634207 in words is "two hundred fifty-six million, six hundred thirty-four thousand, two hundred seven".