28791930 has 32 divisors (see below), whose sum is σ = 70052544. Its totient is φ = 7572096.

The previous prime is 28791923. The next prime is 28791937. The reversal of 28791930 is 3919782.

It is an interprime number because it is at equal distance from previous prime (28791923) and next prime (28791937).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28791937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4384 + ... + 8763.

It is an arithmetic number, because the mean of its divisors is an integer number (2189142).

Almost surely, 2^28791930 is an apocalyptic number.

28791930 is an abundant number, since it is smaller than the sum of its proper divisors (41260614).

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

28791930 is a wasteful number, since it uses less digits than its factorization.

28791930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13230.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 28791930 is about 5365.8112154641. The cubic root of 28791930 is about 306.4951401110.

The spelling of 28791930 in words is "twenty-eight million, seven hundred ninety-one thousand, nine hundred thirty".