28213532 has 12 divisors (see below), whose sum is σ = 49660296. Its totient is φ = 14024880.

The previous prime is 28213531. The next prime is 28213541. The reversal of 28213532 is 23531282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28213531) 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 3 ways as a sum of consecutive naturals, for example, 19694 + ... + 21077.

It is an arithmetic number, because the mean of its divisors is an integer number (4138358).

Almost surely, 2^28213532 is an apocalyptic number.

It is an amenable number.

28213532 is a deficient number, since it is larger than the sum of its proper divisors (21446764).

28213532 is a wasteful number, since it uses less digits than its factorization.

28213532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40948 (or 40946 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 28213532 is about 5311.6411776399. The cubic root of 28213532 is about 304.4288585900.

The spelling of 28213532 in words is "twenty-eight million, two hundred thirteen thousand, five hundred thirty-two".