864530505 has 24 divisors (see below), whose sum is σ = 1500175872. Its totient is φ = 460573344.

The previous prime is 864530503. The next prime is 864530519. The reversal of 864530505 is 505035468.

864530505 is a `hidden beast` number, since 8 + 645 + 3 + 0 + 5 + 0 + 5 = 666.

It is not a de Polignac number, because 864530505 - 2¹ = 864530503 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 864530505.

It is not an unprimeable number, because it can be changed into a prime (864530503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32472 + ... + 52758.

It is an arithmetic number, because the mean of its divisors is an integer number (62507328).

Almost surely, 2^864530505 is an apocalyptic number.

It is an amenable number.

864530505 is a deficient number, since it is larger than the sum of its proper divisors (635645367).

864530505 is a wasteful number, since it uses less digits than its factorization.

864530505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21245 (or 21242 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 864530505 is about 29402.8996019100. The cubic root of 864530505 is about 952.6355274532.

The spelling of 864530505 in words is "eight hundred sixty-four million, five hundred thirty thousand, five hundred five".