28039739 has 8 divisors (see below), whose sum is σ = 34510560. Its totient is φ = 22185216.

The previous prime is 28039709. The next prime is 28039771. The reversal of 28039739 is 93793082.

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 28039739 - 2¹⁶ = 27974203 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28039696 and 28039705.

It is not an unprimeable number, because it can be changed into a prime (28039709) 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, 153974 + ... + 154155.

It is an arithmetic number, because the mean of its divisors is an integer number (4313820).

Almost surely, 2^28039739 is an apocalyptic number.

28039739 is a deficient number, since it is larger than the sum of its proper divisors (6470821).

28039739 is a wasteful number, since it uses less digits than its factorization.

28039739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308149.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 28039739 is about 5295.2562733073. The cubic root of 28039739 is about 303.8024852431.

The spelling of 28039739 in words is "twenty-eight million, thirty-nine thousand, seven hundred thirty-nine".