28068578251 has 12 divisors (see below), whose sum is σ = 32968801488. Its totient is φ = 23408536032.

The previous prime is 28068578249. The next prime is 28068578269. The reversal of 28068578251 is 15287586082.

It is not a de Polignac number, because 28068578251 - 2¹ = 28068578249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28068578851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1454916 + ... + 1474081.

It is an arithmetic number, because the mean of its divisors is an integer number (2747400124).

Almost surely, 2^28068578251 is an apocalyptic number.

28068578251 is a deficient number, since it is larger than the sum of its proper divisors (4900223237).

28068578251 is an equidigital number, since it uses as much as digits as its factorization.

28068578251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2929078 (or 2929041 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 52.

The spelling of 28068578251 in words is "twenty-eight billion, sixty-eight million, five hundred seventy-eight thousand, two hundred fifty-one".