28771839 has 6 divisors (see below), whose sum is σ = 41559336. Its totient is φ = 19181220.

The previous prime is 28771819. The next prime is 28771889. The reversal of 28771839 is 93817782.

It is not a de Polignac number, because 28771839 - 2⁵ = 28771807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28771794 and 28771803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28771819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1598427 + ... + 1598444.

It is an arithmetic number, because the mean of its divisors is an integer number (6926556).

Almost surely, 2^28771839 is an apocalyptic number.

28771839 is a deficient number, since it is larger than the sum of its proper divisors (12787497).

28771839 is a wasteful number, since it uses less digits than its factorization.

28771839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3196877 (or 3196874 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 28771839 is about 5363.9387580397. The cubic root of 28771839 is about 306.4238327838.

The spelling of 28771839 in words is "twenty-eight million, seven hundred seventy-one thousand, eight hundred thirty-nine".