28077839 has 8 divisors (see below), whose sum is σ = 30243840. Its totient is φ = 25980696.

The previous prime is 28077823. The next prime is 28077851. The reversal of 28077839 is 93877082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28077839 - 2⁴ = 28077823 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28077839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28077869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16367 + ... + 18000.

It is an arithmetic number, because the mean of its divisors is an integer number (3780480).

Almost surely, 2^28077839 is an apocalyptic number.

28077839 is a deficient number, since it is larger than the sum of its proper divisors (2166001).

28077839 is a wasteful number, since it uses less digits than its factorization.

28077839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34429.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 28077839 is about 5298.8526116509. The cubic root of 28077839 is about 303.9400238040.

The spelling of 28077839 in words is "twenty-eight million, seventy-seven thousand, eight hundred thirty-nine".