28112645651 has 16 divisors (see below), whose sum is σ = 30296365440. Its totient is φ = 25999989120.

The previous prime is 28112645599. The next prime is 28112645669. The reversal of 28112645651 is 15654621182.

It is a de Polignac number, because none of the positive numbers 2^k-28112645651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28112645599 and 28112645608.

It is not an unprimeable number, because it can be changed into a prime (28112645851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1757576 + ... + 1773498.

It is an arithmetic number, because the mean of its divisors is an integer number (1893522840).

Almost surely, 2^28112645651 is an apocalyptic number.

28112645651 is a deficient number, since it is larger than the sum of its proper divisors (2183719789).

28112645651 is a wasteful number, since it uses less digits than its factorization.

28112645651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18146.

The product of its digits is 115200, while the sum is 41.

It can be divided in two parts, 2811 and 2645651, that added together give a palindrome (2648462).

The spelling of 28112645651 in words is "twenty-eight billion, one hundred twelve million, six hundred forty-five thousand, six hundred fifty-one".