28190779 has 4 divisors (see below), whose sum is σ = 28449520. Its totient is φ = 27932040.

The previous prime is 28190759. The next prime is 28190803. The reversal of 28190779 is 97709182.

It is a happy number.

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 28190779 - 2²³ = 19802171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28190759) 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 3 ways as a sum of consecutive naturals, for example, 129207 + ... + 129424.

It is an arithmetic number, because the mean of its divisors is an integer number (7112380).

Almost surely, 2^28190779 is an apocalyptic number.

28190779 is a deficient number, since it is larger than the sum of its proper divisors (258741).

28190779 is a wasteful number, since it uses less digits than its factorization.

28190779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258740.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 28190779 is about 5309.4989405781. The cubic root of 28190779 is about 304.3470003210.

The spelling of 28190779 in words is "twenty-eight million, one hundred ninety thousand, seven hundred seventy-nine".