28213943 has 4 divisors (see below), whose sum is σ = 28976520. Its totient is φ = 27451368.

The previous prime is 28213921. The next prime is 28213949. The reversal of 28213943 is 34931282.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28213943 - 2⁸ = 28213687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28213949) 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, 381233 + ... + 381306.

It is an arithmetic number, because the mean of its divisors is an integer number (7244130).

Almost surely, 2^28213943 is an apocalyptic number.

28213943 is a deficient number, since it is larger than the sum of its proper divisors (762577).

28213943 is an equidigital number, since it uses as much as digits as its factorization.

28213943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762576.

The product of its digits is 10368, while the sum is 32.

The square root of 28213943 is about 5311.6798661064. The cubic root of 28213943 is about 304.4303368364.

The spelling of 28213943 in words is "twenty-eight million, two hundred thirteen thousand, nine hundred forty-three".