28069779 has 8 divisors (see below), whose sum is σ = 37953792. Its totient is φ = 18449480.

The previous prime is 28069759. The next prime is 28069801. The reversal of 28069779 is 97796082.

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 28069779 - 2⁵ = 28069747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28069759) 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, 65679 + ... + 66104.

It is an arithmetic number, because the mean of its divisors is an integer number (4744224).

Almost surely, 2^28069779 is an apocalyptic number.

28069779 is a deficient number, since it is larger than the sum of its proper divisors (9884013).

28069779 is a wasteful number, since it uses less digits than its factorization.

28069779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131857.

The product of its (nonzero) digits is 381024, while the sum is 48.

The square root of 28069779 is about 5298.0920150560. The cubic root of 28069779 is about 303.9109381013.

The spelling of 28069779 in words is "twenty-eight million, sixty-nine thousand, seven hundred seventy-nine".