28571107666 has 8 divisors (see below), whose sum is σ = 42857935884. Its totient is φ = 14285129040.

The previous prime is 28571107639. The next prime is 28571107699. The reversal of 28571107666 is 66670117582.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26820940441 + 1750167225 = 163771^2 + 41835^2 .

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

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, 120345 + ... + 267628.

Almost surely, 2^28571107666 is an apocalyptic number.

28571107666 is a deficient number, since it is larger than the sum of its proper divisors (14286828218).

28571107666 is a wasteful number, since it uses less digits than its factorization.

28571107666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424796.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 28571107666 in words is "twenty-eight billion, five hundred seventy-one million, one hundred seven thousand, six hundred sixty-six".