28313978 has 32 divisors (see below), whose sum is σ = 53965440. Its totient is φ = 10820160.

The previous prime is 28313977. The next prime is 28313983. The reversal of 28313978 is 87931382.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28313977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6428 + ... + 9896.

It is an arithmetic number, because the mean of its divisors is an integer number (1686420).

Almost surely, 2^28313978 is an apocalyptic number.

28313978 is a deficient number, since it is larger than the sum of its proper divisors (25651462).

28313978 is a wasteful number, since it uses less digits than its factorization.

28313978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3542.

The product of its digits is 72576, while the sum is 41.

The square root of 28313978 is about 5321.0880466311. The cubic root of 28313978 is about 304.7897072300.

The spelling of 28313978 in words is "twenty-eight million, three hundred thirteen thousand, nine hundred seventy-eight".