28511142 has 32 divisors (see below), whose sum is σ = 65867904. Its totient is φ = 8131200.

The previous prime is 28511123. The next prime is 28511167. The reversal of 28511142 is 24111582.

It is a congruent number.

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, 11584 + ... + 13827.

It is an arithmetic number, because the mean of its divisors is an integer number (2058372).

Almost surely, 2^28511142 is an apocalyptic number.

28511142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28511142 is an abundant number, since it is smaller than the sum of its proper divisors (37356762).

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

28511142 is a wasteful number, since it uses less digits than its factorization.

28511142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25444.

The product of its digits is 640, while the sum is 24.

The square root of 28511142 is about 5339.5825679542. The cubic root of 28511142 is about 305.4955377338.

It can be divided in two parts, 2851 and 1142, that added together give a palindrome (3993).

The spelling of 28511142 in words is "twenty-eight million, five hundred eleven thousand, one hundred forty-two".