28023953 has 4 divisors (see below), whose sum is σ = 28042980. Its totient is φ = 28004928.

The previous prime is 28023943. The next prime is 28023971. The reversal of 28023953 is 35932082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26956864 + 1067089 = 5192^2 + 1033^2 .

It is a cyclic number.

It is not a de Polignac number, because 28023953 - 2¹² = 28019857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28023923) 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 3 ways as a sum of consecutive naturals, for example, 7100 + ... + 10317.

It is an arithmetic number, because the mean of its divisors is an integer number (7010745).

Almost surely, 2^28023953 is an apocalyptic number.

It is an amenable number.

28023953 is a deficient number, since it is larger than the sum of its proper divisors (19027).

28023953 is a wasteful number, since it uses less digits than its factorization.

28023953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19026.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 28023953 is about 5293.7654840387. The cubic root of 28023953 is about 303.7454622883.

The spelling of 28023953 in words is "twenty-eight million, twenty-three thousand, nine hundred fifty-three".