864660405 has 32 divisors (see below), whose sum is σ = 1582424064. Its totient is φ = 394940736.

The previous prime is 864660389. The next prime is 864660427. The reversal of 864660405 is 504066468.

It is not a de Polignac number, because 864660405 - 2⁴ = 864660389 is a prime.

It is a Curzon number.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 157212 + ... + 162618.

It is an arithmetic number, because the mean of its divisors is an integer number (49450752).

Almost surely, 2^864660405 is an apocalyptic number.

It is an amenable number.

864660405 is a deficient number, since it is larger than the sum of its proper divisors (717763659).

864660405 is a wasteful number, since it uses less digits than its factorization.

864660405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6945.

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 864660405 is about 29405.1084847514. The cubic root of 864660405 is about 952.6832378027.

The spelling of 864660405 in words is "eight hundred sixty-four million, six hundred sixty thousand, four hundred five".