28621373 has 4 divisors (see below), whose sum is σ = 31223328. Its totient is φ = 26019420.

The previous prime is 28621367. The next prime is 28621379. The reversal of 28621373 is 37312682.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (28621367) and next prime (28621379).

It is a cyclic number.

It is not a de Polignac number, because 28621373 - 2⁴ = 28621357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28621379) 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, 1300961 + ... + 1300982.

It is an arithmetic number, because the mean of its divisors is an integer number (7805832).

Almost surely, 2^28621373 is an apocalyptic number.

It is an amenable number.

28621373 is a deficient number, since it is larger than the sum of its proper divisors (2601955).

28621373 is a wasteful number, since it uses less digits than its factorization.

28621373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2601954.

The product of its digits is 12096, while the sum is 32.

The square root of 28621373 is about 5349.8946718604. The cubic root of 28621373 is about 305.8887380824. Note that the first 3 decimals are identical.

The spelling of 28621373 in words is "twenty-eight million, six hundred twenty-one thousand, three hundred seventy-three".