28292978 has 16 divisors (see below), whose sum is σ = 49325760. Its totient is φ = 11919696.

The previous prime is 28292977. The next prime is 28292983. The reversal of 28292978 is 87929282.

It is not an unprimeable number, because it can be changed into a prime (28292977) by changing a digit.

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, 16301 + ... + 17952.

It is an arithmetic number, because the mean of its divisors is an integer number (3082860).

Almost surely, 2^28292978 is an apocalyptic number.

28292978 is a deficient number, since it is larger than the sum of its proper divisors (21032782).

28292978 is a wasteful number, since it uses less digits than its factorization.

28292978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34321.

The product of its digits is 290304, while the sum is 47.

The square root of 28292978 is about 5319.1143999730. The cubic root of 28292978 is about 304.7143361311.

The spelling of 28292978 in words is "twenty-eight million, two hundred ninety-two thousand, nine hundred seventy-eight".