28645561 has 8 divisors (see below), whose sum is σ = 34663680. Its totient is φ = 23108928.

The previous prime is 28645531. The next prime is 28645567. The reversal of 28645561 is 16554682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28645561 - 2¹⁷ = 28514489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28645561.

It is not an unprimeable number, because it can be changed into a prime (28645567) 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 7 ways as a sum of consecutive naturals, for example, 120241 + ... + 120478.

It is an arithmetic number, because the mean of its divisors is an integer number (4332960).

Almost surely, 2^28645561 is an apocalyptic number.

It is an amenable number.

28645561 is a deficient number, since it is larger than the sum of its proper divisors (6018119).

28645561 is a wasteful number, since it uses less digits than its factorization.

28645561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240743.

The product of its digits is 57600, while the sum is 37.

The square root of 28645561 is about 5352.1547997045. The cubic root of 28645561 is about 305.9748829541.

The spelling of 28645561 in words is "twenty-eight million, six hundred forty-five thousand, five hundred sixty-one".