28402779 has 8 divisors (see below), whose sum is σ = 37986112. Its totient is φ = 18877320.

The previous prime is 28402771. The next prime is 28402793. The reversal of 28402779 is 97720482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28402779 - 2³ = 28402771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28402771) 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, 13309 + ... + 15294.

It is an arithmetic number, because the mean of its divisors is an integer number (4748264).

Almost surely, 2^28402779 is an apocalyptic number.

28402779 is a deficient number, since it is larger than the sum of its proper divisors (9583333).

28402779 is a wasteful number, since it uses less digits than its factorization.

28402779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28937.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 28402779 is about 5329.4257664405. The cubic root of 28402779 is about 305.1080115521.

The spelling of 28402779 in words is "twenty-eight million, four hundred two thousand, seven hundred seventy-nine".