28542213 has 40 divisors (see below), whose sum is σ = 49484160. Its totient is φ = 16057440.

The previous prime is 28542209. The next prime is 28542221. The reversal of 28542213 is 31224582.

It is not a de Polignac number, because 28542213 - 2² = 28542209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28542203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 39903 + ... + 40611.

It is an arithmetic number, because the mean of its divisors is an integer number (1237104).

Almost surely, 2^28542213 is an apocalyptic number.

It is an amenable number.

28542213 is a deficient number, since it is larger than the sum of its proper divisors (20941947).

28542213 is an equidigital number, since it uses as much as digits as its factorization.

28542213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799 (or 790 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 28542213 is about 5342.4912728052. The cubic root of 28542213 is about 305.6064722104.

Adding to 28542213 its reverse (31224582), we get a palindrome (59766795).

The spelling of 28542213 in words is "twenty-eight million, five hundred forty-two thousand, two hundred thirteen".