28878770398 has 4 divisors (see below), whose sum is σ = 43318155600. Its totient is φ = 14439385198.

The previous prime is 28878770363. The next prime is 28878770413. The reversal of 28878770398 is 89307787882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89307787882 = 2 ⋅44653893941.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7219692598 + ... + 7219692601.

It is an arithmetic number, because the mean of its divisors is an integer number (10829538900).

Almost surely, 2^28878770398 is an apocalyptic number.

28878770398 is a deficient number, since it is larger than the sum of its proper divisors (14439385202).

28878770398 is a wasteful number, since it uses less digits than its factorization.

28878770398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14439385201.

The product of its (nonzero) digits is 75866112, while the sum is 67.

The spelling of 28878770398 in words is "twenty-eight billion, eight hundred seventy-eight million, seven hundred seventy thousand, three hundred ninety-eight".