28961279 has 4 divisors (see below), whose sum is σ = 29155800. Its totient is φ = 28766760.

The previous prime is 28961243. The next prime is 28961281. The reversal of 28961279 is 97216982.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28961279 - 2¹⁶ = 28895743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28961239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97037 + ... + 97334.

It is an arithmetic number, because the mean of its divisors is an integer number (7288950).

Almost surely, 2^28961279 is an apocalyptic number.

28961279 is a deficient number, since it is larger than the sum of its proper divisors (194521).

28961279 is a wasteful number, since it uses less digits than its factorization.

28961279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194520.

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

The square root of 28961279 is about 5381.5684516691. The cubic root of 28961279 is about 307.0948823779.

The spelling of 28961279 in words is "twenty-eight million, nine hundred sixty-one thousand, two hundred seventy-nine".