28015810861 has 8 divisors (see below), whose sum is σ = 28057139264. Its totient is φ = 27974509920.

The previous prime is 28015810853. The next prime is 28015810871. The reversal of 28015810861 is 16801851082.

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

It is a cyclic number.

It is not a de Polignac number, because 28015810861 - 2³ = 28015810853 is a prime.

It is a super-2 number, since 2×28015810861² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28015810871) 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, 2850646 + ... + 2860456.

It is an arithmetic number, because the mean of its divisors is an integer number (3507142408).

Almost surely, 2^28015810861 is an apocalyptic number.

It is an amenable number.

28015810861 is a deficient number, since it is larger than the sum of its proper divisors (41328403).

28015810861 is an equidigital number, since it uses as much as digits as its factorization.

28015810861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13731.

The product of its (nonzero) digits is 30720, while the sum is 40.

The spelling of 28015810861 in words is "twenty-eight billion, fifteen million, eight hundred ten thousand, eight hundred sixty-one".