264798865 has 16 divisors (see below), whose sum is σ = 329081616. Its totient is φ = 204422400.

The previous prime is 264798847. The next prime is 264798887. The reversal of 264798865 is 568897462.

It can be written as a sum of positive squares in 8 ways, for example, as 95902849 + 168896016 = 9793^2 + 12996^2 .

It is not a de Polignac number, because 264798865 - 2¹⁵ = 264766097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7975 + ... + 24355.

It is an arithmetic number, because the mean of its divisors is an integer number (20567601).

Almost surely, 2^264798865 is an apocalyptic number.

It is an amenable number.

264798865 is a deficient number, since it is larger than the sum of its proper divisors (64282751).

264798865 is a wasteful number, since it uses less digits than its factorization.

264798865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16500.

The product of its digits is 5806080, while the sum is 55.

The square root of 264798865 is about 16272.6416109985. The cubic root of 264798865 is about 642.1532818202.

It can be divided in two parts, 26479 and 8865, that added together give a square (35344 = 188²).

The spelling of 264798865 in words is "two hundred sixty-four million, seven hundred ninety-eight thousand, eight hundred sixty-five".