28000664658 has 30 divisors (see below), whose sum is σ = 62747002791. Its totient is φ = 9332844948.

The previous prime is 28000664651. The next prime is 28000664693. The reversal of 28000664658 is 85646600082.

It can be written as a sum of positive squares in only one way, i.e., 14000332329 + 14000332329 = 118323^2 + 118323^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=118323.

It is a super-3 number, since 3×28000664658³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (28000664651) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2123241 + ... + 2136387.

Almost surely, 2^28000664658 is an apocalyptic number.

28000664658 is an abundant number, since it is smaller than the sum of its proper divisors (34746338133).

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

28000664658 is an frugal number, since it uses more digits than its factorization.

28000664658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26308 (or 13152 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 28000664658 in words is "twenty-eight billion, six hundred sixty-four thousand, six hundred fifty-eight".