28693865540 has 12 divisors (see below), whose sum is σ = 60257117676. Its totient is φ = 11477546208.

The previous prime is 28693865513. The next prime is 28693865609. The reversal of 28693865540 is 4556839682.

It can be written as a sum of positive squares in 2 ways, for example, as 3377236996 + 25316628544 = 58114^2 + 159112^2 .

It is a super-3 number, since 3×28693865540³ (a number of 32 digits) contains 333 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, 717346619 + ... + 717346658.

It is an arithmetic number, because the mean of its divisors is an integer number (5021426473).

Almost surely, 2^28693865540 is an apocalyptic number.

28693865540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28693865540 is an abundant number, since it is smaller than the sum of its proper divisors (31563252136).

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

28693865540 is a wasteful number, since it uses less digits than its factorization.

28693865540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434693286 (or 1434693284 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 56.

The spelling of 28693865540 in words is "twenty-eight billion, six hundred ninety-three million, eight hundred sixty-five thousand, five hundred forty".