28181332 has 24 divisors (see below), whose sum is σ = 52085600. Its totient is φ = 13304736.

The previous prime is 28181317. The next prime is 28181347. The reversal of 28181332 is 23318182.

It is an interprime number because it is at equal distance from previous prime (28181317) and next prime (28181347).

It is a self number, because there is not a number n which added to its sum of digits gives 28181332.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 39394 + ... + 40102.

Almost surely, 2^28181332 is an apocalyptic number.

It is an amenable number.

28181332 is a deficient number, since it is larger than the sum of its proper divisors (23904268).

28181332 is a wasteful number, since it uses less digits than its factorization.

28181332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255 (or 1253 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 28181332 is about 5308.6092340650. The cubic root of 28181332 is about 304.3129999914.

The spelling of 28181332 in words is "twenty-eight million, one hundred eighty-one thousand, three hundred thirty-two".