28079402 has 8 divisors (see below), whose sum is σ = 45359076. Its totient is φ = 12959712.

The previous prime is 28079399. The next prime is 28079407. The reversal of 28079402 is 20497082.

It is a Cunningham number, because it is equal to 5299²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 28079401 + 1 = 5299^2 + 1^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28079407) 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, 539963 + ... + 540014.

Almost surely, 2^28079402 is an apocalyptic number.

28079402 is a deficient number, since it is larger than the sum of its proper divisors (17279674).

28079402 is a wasteful number, since it uses less digits than its factorization.

28079402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079992.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 28079402 is about 5299.0000943574. Note that the first 4 decimals coincide. The cubic root of 28079402 is about 303.9456634765.

The spelling of 28079402 in words is "twenty-eight million, seventy-nine thousand, four hundred two".