866869056 has 42 divisors (see below), whose sum is σ = 2484725282. Its totient is φ = 288956160.

The previous prime is 866869039. The next prime is 866869067. The reversal of 866869056 is 650968668.

It can be written as a sum of positive squares in only one way, i.e., 864360000 + 2509056 = 29400^2 + 1584^2 .

It is a super-2 number, since 2×866869056² = 1502923920500662272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 866868993 and 866869011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 751915 + ... + 753066.

Almost surely, 2^866869056 is an apocalyptic number.

It is an amenable number.

866869056 is an abundant number, since it is smaller than the sum of its proper divisors (1617856226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866869056 is a wasteful number, since it uses less digits than its factorization.

866869056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504999 (or 1504986 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The square root of 866869056 is about 29442.6400990129. The cubic root of 866869056 is about 953.4937123478.

The spelling of 866869056 in words is "eight hundred sixty-six million, eight hundred sixty-nine thousand, fifty-six".