28781150 has 12 divisors (see below), whose sum is σ = 53533032. Its totient is φ = 11512440.

The previous prime is 28781141. The next prime is 28781167. The reversal of 28781150 is 5118782.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 287762 + ... + 287861.

It is an arithmetic number, because the mean of its divisors is an integer number (4461086).

Almost surely, 2^28781150 is an apocalyptic number.

28781150 is a deficient number, since it is larger than the sum of its proper divisors (24751882).

28781150 is a wasteful number, since it uses less digits than its factorization.

28781150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575635 (or 575630 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 28781150 is about 5364.8066134764. The cubic root of 28781150 is about 306.4568836731.

The spelling of 28781150 in words is "twenty-eight million, seven hundred eighty-one thousand, one hundred fifty".