28081142 has 4 divisors (see below), whose sum is σ = 42121716. Its totient is φ = 14040570.

The previous prime is 28081117. The next prime is 28081153. The reversal of 28081142 is 24118082.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7020284 + ... + 7020287.

It is an arithmetic number, because the mean of its divisors is an integer number (10530429).

Almost surely, 2^28081142 is an apocalyptic number.

28081142 is a deficient number, since it is larger than the sum of its proper divisors (14040574).

28081142 is a wasteful number, since it uses less digits than its factorization.

28081142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14040573.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 28081142 is about 5299.1642737322. The cubic root of 28081142 is about 303.9519415604.

The spelling of 28081142 in words is "twenty-eight million, eighty-one thousand, one hundred forty-two".