864550385 has 8 divisors (see below), whose sum is σ = 1098487656. Its totient is φ = 650955520.

The previous prime is 864550367. The next prime is 864550397. The reversal of 864550385 is 583055468.

It can be written as a sum of positive squares in 4 ways, for example, as 372065521 + 492484864 = 19289^2 + 22192^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 864550385 - 2²⁶ = 797441521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5085506 + ... + 5085675.

It is an arithmetic number, because the mean of its divisors is an integer number (137310957).

Almost surely, 2^864550385 is an apocalyptic number.

864550385 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

864550385 is a deficient number, since it is larger than the sum of its proper divisors (233937271).

864550385 is a wasteful number, since it uses less digits than its factorization.

864550385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10171203.

The product of its (nonzero) digits is 576000, while the sum is 44.

The square root of 864550385 is about 29403.2376618630. The cubic root of 864550385 is about 952.6428293930.

The spelling of 864550385 in words is "eight hundred sixty-four million, five hundred fifty thousand, three hundred eighty-five".