256738765 has 8 divisors (see below), whose sum is σ = 321481728. Its totient is φ = 196460880.

The previous prime is 256738763. The next prime is 256738787. The reversal of 256738765 is 567837652.

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

It is not a de Polignac number, because 256738765 - 2¹ = 256738763 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256738763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1116141 + ... + 1116370.

It is an arithmetic number, because the mean of its divisors is an integer number (40185216).

Almost surely, 2^256738765 is an apocalyptic number.

It is an amenable number.

256738765 is a deficient number, since it is larger than the sum of its proper divisors (64742963).

256738765 is a wasteful number, since it uses less digits than its factorization.

256738765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2232539.

The product of its digits is 2116800, while the sum is 49.

The square root of 256738765 is about 16023.0697745469. The cubic root of 256738765 is about 635.5706239477.

The spelling of 256738765 in words is "two hundred fifty-six million, seven hundred thirty-eight thousand, seven hundred sixty-five".