28223977 has 4 divisors (see below), whose sum is σ = 28242576. Its totient is φ = 28205380.

The previous prime is 28223941. The next prime is 28224011. The reversal of 28223977 is 77932282.

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, and also an emirpimes, since its reverse is a distinct semiprime: 77932282 = 2 ⋅38966141.

It is a cyclic number.

It is not a de Polignac number, because 28223977 - 2¹¹ = 28221929 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28223477) 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, 6799 + ... + 10132.

It is an arithmetic number, because the mean of its divisors is an integer number (7060644).

Almost surely, 2^28223977 is an apocalyptic number.

It is an amenable number.

28223977 is a deficient number, since it is larger than the sum of its proper divisors (18599).

28223977 is a wasteful number, since it uses less digits than its factorization.

28223977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18598.

The product of its digits is 84672, while the sum is 40.

The square root of 28223977 is about 5312.6243044281. The cubic root of 28223977 is about 304.4664217366.

The spelling of 28223977 in words is "twenty-eight million, two hundred twenty-three thousand, nine hundred seventy-seven".