256614749 has 4 divisors (see below), whose sum is σ = 267771936. Its totient is φ = 245457564.

The previous prime is 256614727. The next prime is 256614763. The reversal of 256614749 is 947416652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-256614749 is a prime.

It is a super-2 number, since 2×256614749² = 131702258808666002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256614769) 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, 5578559 + ... + 5578604.

It is an arithmetic number, because the mean of its divisors is an integer number (66942984).

Almost surely, 2^256614749 is an apocalyptic number.

It is an amenable number.

256614749 is a deficient number, since it is larger than the sum of its proper divisors (11157187).

256614749 is a wasteful number, since it uses less digits than its factorization.

256614749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11157186.

The product of its digits is 362880, while the sum is 44.

The square root of 256614749 is about 16019.1993869856. The cubic root of 256614749 is about 635.4682713725.

The spelling of 256614749 in words is "two hundred fifty-six million, six hundred fourteen thousand, seven hundred forty-nine".