28365685738 has 8 divisors (see below), whose sum is σ = 45821492388. Its totient is φ = 13091854944.

The previous prime is 28365685729. The next prime is 28365685759. The reversal of 28365685738 is 83758656382.

It can be written as a sum of positive squares in 2 ways, for example, as 27394553169 + 971132569 = 165513^2 + 31163^2 .

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

It is a super-2 number, since 2×28365685738² (a number of 22 digits) contains 22 as substring.

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, 545493931 + ... + 545493982.

Almost surely, 2^28365685738 is an apocalyptic number.

28365685738 is a deficient number, since it is larger than the sum of its proper divisors (17455806650).

28365685738 is a wasteful number, since it uses less digits than its factorization.

28365685738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090987928.

The product of its digits is 58060800, while the sum is 61.

The spelling of 28365685738 in words is "twenty-eight billion, three hundred sixty-five million, six hundred eighty-five thousand, seven hundred thirty-eight".