28978890 has 16 divisors (see below), whose sum is σ = 69549408. Its totient is φ = 7727696.

The previous prime is 28978889. The next prime is 28978913. The reversal of 28978890 is 9887982.

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, 482952 + ... + 483011.

It is an arithmetic number, because the mean of its divisors is an integer number (4346838).

Almost surely, 2^28978890 is an apocalyptic number.

28978890 is an abundant number, since it is smaller than the sum of its proper divisors (40570518).

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

28978890 is a wasteful number, since it uses less digits than its factorization.

28978890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965973.

The product of its (nonzero) digits is 580608, while the sum is 51.

The square root of 28978890 is about 5383.2044360214. The cubic root of 28978890 is about 307.1571166472.

The spelling of 28978890 in words is "twenty-eight million, nine hundred seventy-eight thousand, eight hundred ninety".