28647462861 has 20 divisors (see below), whose sum is σ = 43950966972. Its totient is φ = 18582136128.

The previous prime is 28647462817. The next prime is 28647462901. The reversal of 28647462861 is 16826474682.

It is a happy number.

28647462861 is a `hidden beast` number, since 2 + 8 + 6 + 4 + 7 + 4 + 628 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27025387236 + 1622075625 = 164394^2 + 40275^2 .

It is not a de Polignac number, because 28647462861 - 2⁶ = 28647462797 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28647462798 and 28647462807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28647462661) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4776360 + ... + 4782353.

Almost surely, 2^28647462861 is an apocalyptic number.

It is an amenable number.

28647462861 is a deficient number, since it is larger than the sum of its proper divisors (15303504111).

28647462861 is an equidigital number, since it uses as much as digits as its factorization.

28647462861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9558762 (or 9558753 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 54.

The spelling of 28647462861 in words is "twenty-eight billion, six hundred forty-seven million, four hundred sixty-two thousand, eight hundred sixty-one".