28079401 has 9 divisors (see below), whose sum is σ = 32706999. Its totient is φ = 24036264.

The previous prime is 28079399. The next prime is 28079407. The reversal of 28079401 is 10497082.

The square root of 28079401 is 5299.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 17347225 + 10732176 = 4165^2 + 3276^2 .

It is not a de Polignac number, because 28079401 - 2¹ = 28079399 is a prime.

It is a Duffinian number.

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 8 ways as a sum of consecutive naturals, for example, 36715 + ... + 37471.

It is an arithmetic number, because the mean of its divisors is an integer number (3634111).

Almost surely, 2^28079401 is an apocalyptic number.

28079401 is the 5299-th square number.

28079401 is the 2650-th centered octagonal number.

It is an amenable number.

28079401 is a deficient number, since it is larger than the sum of its proper divisors (4627598).

28079401 is an frugal number, since it uses more digits than its factorization.

28079401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528 (or 764 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The cubic root of 28079401 is about 303.9456598683.

The spelling of 28079401 in words is "twenty-eight million, seventy-nine thousand, four hundred one".