28066964738 has 6 divisors (see below), whose sum is σ = 42100802499. Its totient is φ = 14033363906.

The previous prime is 28066964693. The next prime is 28066964777. The reversal of 28066964738 is 83746966082.

It can be written as a sum of positive squares in only one way, i.e., 14033482369 + 14033482369 = 118463^2 + 118463^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=118463.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 177695 + ... + 296157.

Almost surely, 2^28066964738 is an apocalyptic number.

28066964738 is a deficient number, since it is larger than the sum of its proper divisors (14033837761).

28066964738 is an frugal number, since it uses more digits than its factorization.

28066964738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236928 (or 118465 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 59.

The spelling of 28066964738 in words is "twenty-eight billion, sixty-six million, nine hundred sixty-four thousand, seven hundred thirty-eight".