28771830 has 24 divisors (see below), whose sum is σ = 74806992. Its totient is φ = 7672464.

The previous prime is 28771819. The next prime is 28771889. The reversal of 28771830 is 3817782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159754 + ... + 159933.

It is an arithmetic number, because the mean of its divisors is an integer number (3116958).

Almost surely, 2^28771830 is an apocalyptic number.

28771830 is an abundant number, since it is smaller than the sum of its proper divisors (46035162).

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

28771830 is a wasteful number, since it uses less digits than its factorization.

28771830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319700 (or 319697 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 28771830 is about 5363.9379191038. The cubic root of 28771830 is about 306.4238008334.

The spelling of 28771830 in words is "twenty-eight million, seven hundred seventy-one thousand, eight hundred thirty".