28019375811 has 12 divisors (see below), whose sum is σ = 46254207792. Its totient is φ = 16011071856.

The previous prime is 28019375801. The next prime is 28019375849. The reversal of 28019375811 is 11857391082.

28019375811 is a `hidden beast` number, since 28 + 0 + 19 + 37 + 581 + 1 = 666.

It is not a de Polignac number, because 28019375811 - 2¹³ = 28019367619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28019375801) 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, 222375936 + ... + 222376061.

It is an arithmetic number, because the mean of its divisors is an integer number (3854517316).

Almost surely, 2^28019375811 is an apocalyptic number.

28019375811 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28019375811 is a deficient number, since it is larger than the sum of its proper divisors (18234831981).

28019375811 is a wasteful number, since it uses less digits than its factorization.

28019375811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444752010 (or 444752007 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The spelling of 28019375811 in words is "twenty-eight billion, nineteen million, three hundred seventy-five thousand, eight hundred eleven".