28332778 has 16 divisors (see below), whose sum is σ = 45209664. Its totient is φ = 13270720.

The previous prime is 28332751. The next prime is 28332847. The reversal of 28332778 is 87723382.

It is a self number, because there is not a number n which added to its sum of digits gives 28332778.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5883 + ... + 9553.

It is an arithmetic number, because the mean of its divisors is an integer number (2825604).

Almost surely, 2^28332778 is an apocalyptic number.

28332778 is a deficient number, since it is larger than the sum of its proper divisors (16876886).

28332778 is a wasteful number, since it uses less digits than its factorization.

28332778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3917.

The product of its digits is 112896, while the sum is 40.

The square root of 28332778 is about 5322.8543094847. The cubic root of 28332778 is about 304.8571506996.

The spelling of 28332778 in words is "twenty-eight million, three hundred thirty-two thousand, seven hundred seventy-eight".