1864328265 has 64 divisors (see below), whose sum is σ = 3428179200. Its totient is φ = 960740352.

The previous prime is 1864328243. The next prime is 1864328281. The reversal of 1864328265 is 5628234681.

1864328265 is a `hidden beast` number, since 1 + 8 + 64 + 328 + 265 = 666.

It is not a de Polignac number, because 1864328265 - 2⁵ = 1864328233 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1864328265.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 477441 + ... + 481329.

It is an arithmetic number, because the mean of its divisors is an integer number (53565300).

Almost surely, 2^1864328265 is an apocalyptic number.

1864328265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1864328265 is a deficient number, since it is larger than the sum of its proper divisors (1563850935).

1864328265 is a wasteful number, since it uses less digits than its factorization.

1864328265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4023 (or 4017 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 1864328265 is about 43177.8677681055. The cubic root of 1864328265 is about 1230.7621392024.

The spelling of 1864328265 in words is "one billion, eight hundred sixty-four million, three hundred twenty-eight thousand, two hundred sixty-five".