28113405777 has 32 divisors (see below), whose sum is σ = 42517094400. Its totient is φ = 18354275856.

The previous prime is 28113405773. The next prime is 28113405779. The reversal of 28113405777 is 77750431182.

28113405777 is a `hidden beast` number, since 28 + 1 + 13 + 40 + 577 + 7 = 666.

It is not a de Polignac number, because 28113405777 - 2² = 28113405773 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28113405773) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 385408 + ... + 452510.

It is an arithmetic number, because the mean of its divisors is an integer number (1328659200).

Almost surely, 2^28113405777 is an apocalyptic number.

28113405777 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28113405777 is a deficient number, since it is larger than the sum of its proper divisors (14403688623).

28113405777 is a wasteful number, since it uses less digits than its factorization.

28113405777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67434 (or 67428 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The spelling of 28113405777 in words is "twenty-eight billion, one hundred thirteen million, four hundred five thousand, seven hundred seventy-seven".