28511276680 has 16 divisors (see below), whose sum is σ = 64150372620. Its totient is φ = 11404510656.

The previous prime is 28511276641. The next prime is 28511276683. The reversal of 28511276680 is 8667211582.

It can be written as a sum of positive squares in 2 ways, for example, as 28413147844 + 98128836 = 168562^2 + 9906^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28511276680.

It is not an unprimeable number, because it can be changed into a prime (28511276683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356390919 + ... + 356390998.

Almost surely, 2^28511276680 is an apocalyptic number.

28511276680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28511276680 is an abundant number, since it is smaller than the sum of its proper divisors (35639095940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28511276680 is a wasteful number, since it uses less digits than its factorization.

28511276680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712781928 (or 712781924 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 28511276680 in words is "twenty-eight billion, five hundred eleven million, two hundred seventy-six thousand, six hundred eighty".