28650310861 has 4 divisors (see below), whose sum is σ = 28651188924. Its totient is φ = 28649432800.

The previous prime is 28650310811. The next prime is 28650310867. The reversal of 28650310861 is 16801305682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4596162025 + 24054148836 = 67795^2 + 155094^2 .

It is a cyclic number.

It is not a de Polignac number, because 28650310861 - 2²¹ = 28648213709 is a prime.

It is a super-2 number, since 2×28650310861² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28650310867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388120 + ... + 456001.

It is an arithmetic number, because the mean of its divisors is an integer number (7162797231).

Almost surely, 2^28650310861 is an apocalyptic number.

It is an amenable number.

28650310861 is a deficient number, since it is larger than the sum of its proper divisors (878063).

28650310861 is an equidigital number, since it uses as much as digits as its factorization.

28650310861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878062.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 28650310861 in words is "twenty-eight billion, six hundred fifty million, three hundred ten thousand, eight hundred sixty-one".