28484561 has 16 divisors (see below), whose sum is σ = 33926400. Its totient is φ = 23405760.

The previous prime is 28484549. The next prime is 28484563. The reversal of 28484561 is 16548482.

It is a happy number.

It is not a de Polignac number, because 28484561 - 2¹⁰ = 28483537 is a prime.

It is a super-2 number, since 2×28484561² = 1622740430725442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28484563) 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 15 ways as a sum of consecutive naturals, for example, 17615 + ... + 19163.

It is an arithmetic number, because the mean of its divisors is an integer number (2120400).

Almost surely, 2^28484561 is an apocalyptic number.

It is an amenable number.

28484561 is a deficient number, since it is larger than the sum of its proper divisors (5441839).

28484561 is a wasteful number, since it uses less digits than its factorization.

28484561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664.

The product of its digits is 61440, while the sum is 38.

The square root of 28484561 is about 5337.0929352973. The cubic root of 28484561 is about 305.4005701624.

The spelling of 28484561 in words is "twenty-eight million, four hundred eighty-four thousand, five hundred sixty-one".