28861791 has 32 divisors (see below), whose sum is σ = 45408768. Its totient is φ = 15966720.

The previous prime is 28861769. The next prime is 28861793. The reversal of 28861791 is 19716882.

It is not a de Polignac number, because 28861791 - 2⁵ = 28861759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28861793) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102571 + ... + 102851.

It is an arithmetic number, because the mean of its divisors is an integer number (1419024).

Almost surely, 2^28861791 is an apocalyptic number.

28861791 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28861791 is a deficient number, since it is larger than the sum of its proper divisors (16546977).

28861791 is a wasteful number, since it uses less digits than its factorization.

28861791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431.

The product of its digits is 48384, while the sum is 42.

The square root of 28861791 is about 5372.3170978638. The cubic root of 28861791 is about 306.7428340789.

The spelling of 28861791 in words is "twenty-eight million, eight hundred sixty-one thousand, seven hundred ninety-one".