28521373 has 4 divisors (see below), whose sum is σ = 28865088. Its totient is φ = 28177660.

The previous prime is 28521371. The next prime is 28521379. The reversal of 28521373 is 37312582.

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 28521373 - 2¹ = 28521371 is a prime.

It is a Smith number, since the sum of its digits (31) 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28521371) 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, 171733 + ... + 171898.

It is an arithmetic number, because the mean of its divisors is an integer number (7216272).

Almost surely, 2^28521373 is an apocalyptic number.

It is an amenable number.

28521373 is a deficient number, since it is larger than the sum of its proper divisors (343715).

28521373 is an equidigital number, since it uses as much as digits as its factorization.

28521373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343714.

The product of its digits is 10080, while the sum is 31.

The square root of 28521373 is about 5340.5405157156. The cubic root of 28521373 is about 305.5320749242.

It can be divided in two parts, 2852 and 1373, that added together give a square (4225 = 65²).

The spelling of 28521373 in words is "twenty-eight million, five hundred twenty-one thousand, three hundred seventy-three".