264378861 has 12 divisors (see below), whose sum is σ = 386172540. Its totient is φ = 174271680.

The previous prime is 264378857. The next prime is 264378887. The reversal of 264378861 is 168873462.

It can be written as a sum of positive squares in 2 ways, for example, as 21206025 + 243172836 = 4605^2 + 15594^2 .

It is not a de Polignac number, because 264378861 - 2² = 264378857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264378841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 164230 + ... + 165831.

It is an arithmetic number, because the mean of its divisors is an integer number (32181045).

Almost surely, 2^264378861 is an apocalyptic number.

It is an amenable number.

264378861 is a deficient number, since it is larger than the sum of its proper divisors (121793679).

264378861 is a wasteful number, since it uses less digits than its factorization.

264378861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330156 (or 330153 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 264378861 is about 16259.7312708421. The cubic root of 264378861 is about 641.8135904485.

The spelling of 264378861 in words is "two hundred sixty-four million, three hundred seventy-eight thousand, eight hundred sixty-one".