28039649 has 8 divisors (see below), whose sum is σ = 32198880. Its totient is φ = 24148800.

The previous prime is 28039639. The next prime is 28039651. The reversal of 28039649 is 94693082.

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 28039649 - 2⁸ = 28039393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28039639) 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, 66872 + ... + 67289.

It is an arithmetic number, because the mean of its divisors is an integer number (4024860).

Almost surely, 2^28039649 is an apocalyptic number.

It is an amenable number.

28039649 is a deficient number, since it is larger than the sum of its proper divisors (4159231).

28039649 is a wasteful number, since it uses less digits than its factorization.

28039649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134191.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 28039649 is about 5295.2477751282. The cubic root of 28039649 is about 303.8021602014.

The spelling of 28039649 in words is "twenty-eight million, thirty-nine thousand, six hundred forty-nine".