28012779 has 12 divisors (see below), whose sum is σ = 41227056. Its totient is φ = 18322512.

The previous prime is 28012769. The next prime is 28012793. The reversal of 28012779 is 97721082.

It is not a de Polignac number, because 28012779 - 2⁹ = 28012267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28012769) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28887 + ... + 29840.

It is an arithmetic number, because the mean of its divisors is an integer number (3435588).

Almost surely, 2^28012779 is an apocalyptic number.

28012779 is a deficient number, since it is larger than the sum of its proper divisors (13214277).

28012779 is a wasteful number, since it uses less digits than its factorization.

28012779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58786 (or 58783 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 28012779 is about 5292.7099863869. The cubic root of 28012779 is about 303.7050860787.

The spelling of 28012779 in words is "twenty-eight million, twelve thousand, seven hundred seventy-nine".