28576661 has 4 divisors (see below), whose sum is σ = 28636800. Its totient is φ = 28516524.

The previous prime is 28576621. The next prime is 28576663. The reversal of 28576661 is 16667582.

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 28576661 - 2²² = 24382357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28576663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29351 + ... + 30308.

It is an arithmetic number, because the mean of its divisors is an integer number (7159200).

Almost surely, 2^28576661 is an apocalyptic number.

It is an amenable number.

28576661 is a deficient number, since it is larger than the sum of its proper divisors (60139).

28576661 is an equidigital number, since it uses as much as digits as its factorization.

28576661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60138.

The product of its digits is 120960, while the sum is 41.

The square root of 28576661 is about 5345.7142647171. The cubic root of 28576661 is about 305.7293697040.

The spelling of 28576661 in words is "twenty-eight million, five hundred seventy-six thousand, six hundred sixty-one".