28181490 has 32 divisors (see below), whose sum is σ = 67896576. Its totient is φ = 7486080.

The previous prime is 28181471. The next prime is 28181501. The reversal of 28181490 is 9418182.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6759 + ... + 10101.

It is an arithmetic number, because the mean of its divisors is an integer number (2121768).

Almost surely, 2^28181490 is an apocalyptic number.

28181490 is an abundant number, since it is smaller than the sum of its proper divisors (39715086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28181490 is a wasteful number, since it uses less digits than its factorization.

28181490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3634.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 28181490 is about 5308.6241155313. The cubic root of 28181490 is about 304.3135687055.

The spelling of 28181490 in words is "twenty-eight million, one hundred eighty-one thousand, four hundred ninety".