28791378 has 48 divisors (see below), whose sum is σ = 77777856. Its totient is φ = 7477920.

The previous prime is 28791361. The next prime is 28791379. The reversal of 28791378 is 87319782.

It is not an unprimeable number, because it can be changed into a prime (28791379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9001 + ... + 11772.

It is an arithmetic number, because the mean of its divisors is an integer number (1620372).

Almost surely, 2^28791378 is an apocalyptic number.

28791378 is an abundant number, since it is smaller than the sum of its proper divisors (48986478).

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

28791378 is a wasteful number, since it uses less digits than its factorization.

28791378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20799 (or 20796 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 28791378 is about 5365.7597784470. The cubic root of 28791378 is about 306.4931813863.

The spelling of 28791378 in words is "twenty-eight million, seven hundred ninety-one thousand, three hundred seventy-eight".