866134580 has 12 divisors (see below), whose sum is σ = 1818882660. Its totient is φ = 346453824.

The previous prime is 866134571. The next prime is 866134603. The reversal of 866134580 is 85431668.

It can be written as a sum of positive squares in 2 ways, for example, as 658025104 + 208109476 = 25652^2 + 14426^2 .

It is a super-2 number, since 2×866134580² = 1500378221343552800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21653345 + ... + 21653384.

It is an arithmetic number, because the mean of its divisors is an integer number (151573555).

Almost surely, 2^866134580 is an apocalyptic number.

It is an amenable number.

866134580 is an abundant number, since it is smaller than the sum of its proper divisors (952748080).

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

866134580 is a wasteful number, since it uses less digits than its factorization.

866134580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43306738 (or 43306736 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 866134580 is about 29430.1644575765. The cubic root of 866134580 is about 953.2243459718.

The spelling of 866134580 in words is "eight hundred sixty-six million, one hundred thirty-four thousand, five hundred eighty".