866006864 has 10 divisors (see below), whose sum is σ = 1677888330. Its totient is φ = 433003424.

The previous prime is 866006851. The next prime is 866006873. The reversal of 866006864 is 468600668.

It can be written as a sum of positive squares in only one way, i.e., 566440000 + 299566864 = 23800^2 + 17308^2 .

It is a super-2 number, since 2×866006864² = 1499935776990228992, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27062699 + ... + 27062730.

It is an arithmetic number, because the mean of its divisors is an integer number (167788833).

Almost surely, 2^866006864 is an apocalyptic number.

It is an amenable number.

866006864 is a deficient number, since it is larger than the sum of its proper divisors (811881466).

866006864 is a wasteful number, since it uses less digits than its factorization.

866006864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54125437 (or 54125431 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 44.

The square root of 866006864 is about 29427.9945630007. The cubic root of 866006864 is about 953.1774910574.

The spelling of 866006864 in words is "eight hundred sixty-six million, six thousand, eight hundred sixty-four".