861266064 has 20 divisors (see below), whose sum is σ = 2224937456. Its totient is φ = 287088672.

The previous prime is 861266051. The next prime is 861266071. The reversal of 861266064 is 460662168.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8971474 + ... + 8971569.

Almost surely, 2^861266064 is an apocalyptic number.

It is an amenable number.

861266064 is an abundant number, since it is smaller than the sum of its proper divisors (1363671392).

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

861266064 is a wasteful number, since it uses less digits than its factorization.

861266064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17943054 (or 17943048 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 861266064 is about 29347.3348704784. The cubic root of 861266064 is about 951.4349741331.

The spelling of 861266064 in words is "eight hundred sixty-one million, two hundred sixty-six thousand, sixty-four".