28891882779 has 8 divisors (see below), whose sum is σ = 38523335760. Its totient is φ = 19260842496.

The previous prime is 28891882741. The next prime is 28891882781. The reversal of 28891882779 is 97728819882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28891882779 - 2⁷ = 28891882651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28891882709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146479 + ... + 281495.

It is an arithmetic number, because the mean of its divisors is an integer number (4815416970).

Almost surely, 2^28891882779 is an apocalyptic number.

28891882779 is a deficient number, since it is larger than the sum of its proper divisors (9631452981).

28891882779 is a wasteful number, since it uses less digits than its factorization.

28891882779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206349.

The product of its digits is 65028096, while the sum is 69.

The spelling of 28891882779 in words is "twenty-eight billion, eight hundred ninety-one million, eight hundred eighty-two thousand, seven hundred seventy-nine".