28220373 has 8 divisors (see below), whose sum is σ = 41808000. Its totient is φ = 18813564.

The previous prime is 28220359. The next prime is 28220383. The reversal of 28220373 is 37302282.

It is not a de Polignac number, because 28220373 - 2⁹ = 28219861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1045199 = 28220373 / (2 + 8 + 2 + 2 + 0 + 3 + 7 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28220383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 522573 + ... + 522626.

It is an arithmetic number, because the mean of its divisors is an integer number (5226000).

Almost surely, 2^28220373 is an apocalyptic number.

It is an amenable number.

28220373 is a deficient number, since it is larger than the sum of its proper divisors (13587627).

28220373 is a wasteful number, since it uses less digits than its factorization.

28220373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045208 (or 1045202 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 28220373 is about 5312.2851015359. The cubic root of 28220373 is about 304.4534617901.

The spelling of 28220373 in words is "twenty-eight million, two hundred twenty thousand, three hundred seventy-three".