28279961 has 4 divisors (see below), whose sum is σ = 29768400. Its totient is φ = 26791524.

The previous prime is 28279943. The next prime is 28279987. The reversal of 28279961 is 16997282.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28279961 - 2¹⁴ = 28263577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28279931) 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, 744191 + ... + 744228.

It is an arithmetic number, because the mean of its divisors is an integer number (7442100).

Almost surely, 2^28279961 is an apocalyptic number.

It is an amenable number.

28279961 is a deficient number, since it is larger than the sum of its proper divisors (1488439).

28279961 is a wasteful number, since it uses less digits than its factorization.

28279961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488438.

The product of its digits is 108864, while the sum is 44.

The square root of 28279961 is about 5317.8906532572. The cubic root of 28279961 is about 304.6675980917.

The spelling of 28279961 in words is "twenty-eight million, two hundred seventy-nine thousand, nine hundred sixty-one".