28855739 has 4 divisors (see below), whose sum is σ = 31479000. Its totient is φ = 26232480.

The previous prime is 28855663. The next prime is 28855741. The reversal of 28855739 is 93755882.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28855739 - 2⁸ = 28855483 is a prime.

It is a super-2 number, since 2×28855739² = 1665307346472242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28855693 and 28855702.

It is not an unprimeable number, because it can be changed into a prime (28855769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1311614 + ... + 1311635.

It is an arithmetic number, because the mean of its divisors is an integer number (7869750).

Almost surely, 2^28855739 is an apocalyptic number.

28855739 is a deficient number, since it is larger than the sum of its proper divisors (2623261).

28855739 is a wasteful number, since it uses less digits than its factorization.

28855739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2623260.

The product of its digits is 604800, while the sum is 47.

The square root of 28855739 is about 5371.7538104422. The cubic root of 28855739 is about 306.7213923811.

The spelling of 28855739 in words is "twenty-eight million, eight hundred fifty-five thousand, seven hundred thirty-nine".