28488961 has 4 divisors (see below), whose sum is σ = 29988400. Its totient is φ = 26989524.

The previous prime is 28488959. The next prime is 28489007. The reversal of 28488961 is 16988482.

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 28488961 - 2¹ = 28488959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28498961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 749691 + ... + 749728.

It is an arithmetic number, because the mean of its divisors is an integer number (7497100).

Almost surely, 2^28488961 is an apocalyptic number.

It is an amenable number.

28488961 is a deficient number, since it is larger than the sum of its proper divisors (1499439).

28488961 is a wasteful number, since it uses less digits than its factorization.

28488961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499438.

The product of its digits is 221184, while the sum is 46.

The square root of 28488961 is about 5337.5051288032. The cubic root of 28488961 is about 305.4162943919.

The spelling of 28488961 in words is "twenty-eight million, four hundred eighty-eight thousand, nine hundred sixty-one".