28078765761 has 8 divisors (see below), whose sum is σ = 37439737600. Its totient is φ = 18718485552.

The previous prime is 28078765721. The next prime is 28078765783. The reversal of 28078765761 is 16756787082.

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

It is not a de Polignac number, because 28078765761 - 2⁷ = 28078765633 is a prime.

It is a super-3 number, since 3×28078765761³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28078765711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69310 + ... + 246903.

It is an arithmetic number, because the mean of its divisors is an integer number (4679967200).

Almost surely, 2^28078765761 is an apocalyptic number.

It is an amenable number.

28078765761 is a deficient number, since it is larger than the sum of its proper divisors (9360971839).

28078765761 is a wasteful number, since it uses less digits than its factorization.

28078765761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345815.

The product of its (nonzero) digits is 7902720, while the sum is 57.

The spelling of 28078765761 in words is "twenty-eight billion, seventy-eight million, seven hundred sixty-five thousand, seven hundred sixty-one".