28055739 has 8 divisors (see below), whose sum is σ = 38041920. Its totient is φ = 18386696.

The previous prime is 28055717. The next prime is 28055747. The reversal of 28055739 is 93755082.

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 28055739 - 2⁸ = 28055483 is a prime.

It is a super-2 number, since 2×28055739² = 1574248981672242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28055697 and 28055706.

It is not an unprimeable number, because it can be changed into a prime (28055779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79077 + ... + 79430.

It is an arithmetic number, because the mean of its divisors is an integer number (4755240).

Almost surely, 2^28055739 is an apocalyptic number.

28055739 is a deficient number, since it is larger than the sum of its proper divisors (9986181).

28055739 is a wasteful number, since it uses less digits than its factorization.

28055739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158569.

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 28055739 is about 5296.7668440285. The cubic root of 28055739 is about 303.8602593840.

The spelling of 28055739 in words is "twenty-eight million, fifty-five thousand, seven hundred thirty-nine".