28666766695 has 24 divisors (see below), whose sum is σ = 40672495008. Its totient is φ = 19334952000.

The previous prime is 28666766683. The next prime is 28666766731. The reversal of 28666766695 is 59666766682.

It is not a de Polignac number, because 28666766695 - 2¹³ = 28666758503 is a prime.

It is a super-2 number, since 2×28666766695² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28666766695.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 944131 + ... + 974020.

It is an arithmetic number, because the mean of its divisors is an integer number (1694687292).

Almost surely, 2^28666766695 is an apocalyptic number.

28666766695 is a deficient number, since it is larger than the sum of its proper divisors (12005728313).

28666766695 is a wasteful number, since it uses less digits than its factorization.

28666766695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918231 (or 1918224 counting only the distinct ones).

The product of its digits is 235146240, while the sum is 67.

The spelling of 28666766695 in words is "twenty-eight billion, six hundred sixty-six million, seven hundred sixty-six thousand, six hundred ninety-five".