28027988667 has 12 divisors (see below), whose sum is σ = 46268425840. Its totient is φ = 16015993488.

The previous prime is 28027988657. The next prime is 28027988671. The reversal of 28027988667 is 76688972082.

28027988667 is a `hidden beast` number, since 280 + 279 + 8 + 86 + 6 + 7 = 666.

It is not a de Polignac number, because 28027988667 - 2⁷ = 28027988539 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 444888709 = 28027988667 / (2 + 8 + 0 + 2 + 7 + 9 + 8 + 8 + 6 + 6 + 7).

It is not an unprimeable number, because it can be changed into a prime (28027988657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 222444292 + ... + 222444417.

Almost surely, 2^28027988667 is an apocalyptic number.

28027988667 is a deficient number, since it is larger than the sum of its proper divisors (18240437173).

28027988667 is a wasteful number, since it uses less digits than its factorization.

28027988667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444888722 (or 444888719 counting only the distinct ones).

The product of its (nonzero) digits is 32514048, while the sum is 63.

The spelling of 28027988667 in words is "twenty-eight billion, twenty-seven million, nine hundred eighty-eight thousand, six hundred sixty-seven".