28705090651 has 4 divisors (see below), whose sum is σ = 28751464600. Its totient is φ = 28658716704.

The previous prime is 28705090649. The next prime is 28705090709. The reversal of 28705090651 is 15609050782.

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

It is a cyclic number.

It is not a de Polignac number, because 28705090651 - 2¹ = 28705090649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28705090598 and 28705090607.

It is not an unprimeable number, because it can be changed into a prime (28705090451) 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, 23186046 + ... + 23187283.

It is an arithmetic number, because the mean of its divisors is an integer number (7187866150).

Almost surely, 2^28705090651 is an apocalyptic number.

28705090651 is a deficient number, since it is larger than the sum of its proper divisors (46373949).

28705090651 is an equidigital number, since it uses as much as digits as its factorization.

28705090651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46373948.

The product of its (nonzero) digits is 151200, while the sum is 43.

The spelling of 28705090651 in words is "twenty-eight billion, seven hundred five million, ninety thousand, six hundred fifty-one".