28048661 has 4 divisors (see below), whose sum is σ = 29268192. Its totient is φ = 26829132.

The previous prime is 28048639. The next prime is 28048673. The reversal of 28048661 is 16684082.

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 not a de Polignac number, because 28048661 - 2²² = 23854357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28048681) 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, 609731 + ... + 609776.

It is an arithmetic number, because the mean of its divisors is an integer number (7317048).

Almost surely, 2^28048661 is an apocalyptic number.

It is an amenable number.

28048661 is a deficient number, since it is larger than the sum of its proper divisors (1219531).

28048661 is a wasteful number, since it uses less digits than its factorization.

28048661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219530.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 28048661 is about 5296.0986584466. The cubic root of 28048661 is about 303.8347042584.

The spelling of 28048661 in words is "twenty-eight million, forty-eight thousand, six hundred sixty-one".