28249442 has 16 divisors (see below), whose sum is σ = 45722880. Its totient is φ = 13012752.

The previous prime is 28249423. The next prime is 28249483. The reversal of 28249442 is 24494282.

It is a super-2 number, since 2×28249442² = 1596061946622728, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 21809 + ... + 23067.

It is an arithmetic number, because the mean of its divisors is an integer number (2857680).

Almost surely, 2^28249442 is an apocalyptic number.

28249442 is a deficient number, since it is larger than the sum of its proper divisors (17473438).

28249442 is a wasteful number, since it uses less digits than its factorization.

28249442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137.

The product of its digits is 36864, while the sum is 35.

The square root of 28249442 is about 5315.0204138837. The cubic root of 28249442 is about 304.5579621884.

The spelling of 28249442 in words is "twenty-eight million, two hundred forty-nine thousand, four hundred forty-two".