28821677 has 4 divisors (see below), whose sum is σ = 29310240. Its totient is φ = 28333116.

The previous prime is 28821673. The next prime is 28821701. The reversal of 28821677 is 77612882.

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 28821677 - 2² = 28821673 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 (28821673) 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, 244193 + ... + 244310.

It is an arithmetic number, because the mean of its divisors is an integer number (7327560).

Almost surely, 2^28821677 is an apocalyptic number.

It is an amenable number.

28821677 is a deficient number, since it is larger than the sum of its proper divisors (488563).

28821677 is an equidigital number, since it uses as much as digits as its factorization.

28821677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488562.

The product of its digits is 75264, while the sum is 41.

The square root of 28821677 is about 5368.5824013421. The cubic root of 28821677 is about 306.6006577893.

The spelling of 28821677 in words is "twenty-eight million, eight hundred twenty-one thousand, six hundred seventy-seven".