259728857 has 4 divisors (see below), whose sum is σ = 271021440. Its totient is φ = 248436276.

The previous prime is 259728827. The next prime is 259728877. The reversal of 259728857 is 758827952.

It is a happy number.

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 cyclic number.

It is not a de Polignac number, because 259728857 - 2²⁶ = 192619993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 259728799 and 259728808.

It is not an unprimeable number, because it can be changed into a prime (259728827) 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, 5646257 + ... + 5646302.

It is an arithmetic number, because the mean of its divisors is an integer number (67755360).

Almost surely, 2^259728857 is an apocalyptic number.

It is an amenable number.

259728857 is a deficient number, since it is larger than the sum of its proper divisors (11292583).

259728857 is a wasteful number, since it uses less digits than its factorization.

259728857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11292582.

The product of its digits is 2822400, while the sum is 53.

The square root of 259728857 is about 16116.1055159117. The cubic root of 259728857 is about 638.0284845922.

The spelling of 259728857 in words is "two hundred fifty-nine million, seven hundred twenty-eight thousand, eight hundred fifty-seven".