28459961 has 4 divisors (see below), whose sum is σ = 28561524. Its totient is φ = 28358400.

The previous prime is 28459939. The next prime is 28459979. The reversal of 28459961 is 16995482.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7812025 + 20647936 = 2795^2 + 4544^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28459961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28459061) 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, 50360 + ... + 50921.

It is an arithmetic number, because the mean of its divisors is an integer number (7140381).

Almost surely, 2^28459961 is an apocalyptic number.

It is an amenable number.

28459961 is a deficient number, since it is larger than the sum of its proper divisors (101563).

28459961 is a wasteful number, since it uses less digits than its factorization.

28459961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101562.

The product of its digits is 155520, while the sum is 44.

The square root of 28459961 is about 5334.7878120877. The cubic root of 28459961 is about 305.3126275768.

The spelling of 28459961 in words is "twenty-eight million, four hundred fifty-nine thousand, nine hundred sixty-one".