28778891504 has 40 divisors (see below), whose sum is σ = 61044686640. Its totient is φ = 13034739200.

The previous prime is 28778891497. The next prime is 28778891549. The reversal of 28778891504 is 40519887782.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241499 + ... + 340410.

It is an arithmetic number, because the mean of its divisors is an integer number (1526117166).

Almost surely, 2^28778891504 is an apocalyptic number.

It is an amenable number.

28778891504 is an abundant number, since it is smaller than the sum of its proper divisors (32265795136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28778891504 is a wasteful number, since it uses less digits than its factorization.

28778891504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582209 (or 582203 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 59.

The spelling of 28778891504 in words is "twenty-eight billion, seven hundred seventy-eight million, eight hundred ninety-one thousand, five hundred four".