28088742 has 32 divisors (see below), whose sum is σ = 61605504. Its totient is φ = 8467200.

The previous prime is 28088741. The next prime is 28088747. The reversal of 28088742 is 24788082.

It is a self number, because there is not a number n which added to its sum of digits gives 28088742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28088741) by changing a digit.

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, 12918 + ... + 14934.

It is an arithmetic number, because the mean of its divisors is an integer number (1925172).

Almost surely, 2^28088742 is an apocalyptic number.

28088742 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28088742 is an abundant number, since it is smaller than the sum of its proper divisors (33516762).

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

28088742 is a wasteful number, since it uses less digits than its factorization.

28088742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2244.

The product of its (nonzero) digits is 57344, while the sum is 39.

The square root of 28088742 is about 5299.8813194259. The cubic root of 28088742 is about 303.9793600368.

The spelling of 28088742 in words is "twenty-eight million, eighty-eight thousand, seven hundred forty-two".