28242740 has 24 divisors (see below), whose sum is σ = 62432160. Its totient is φ = 10702368.

The previous prime is 28242719. The next prime is 28242743. The reversal of 28242740 is 4724282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28242743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36782 + ... + 37541.

It is an arithmetic number, because the mean of its divisors is an integer number (2601340).

Almost surely, 2^28242740 is an apocalyptic number.

28242740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28242740 is an abundant number, since it is smaller than the sum of its proper divisors (34189420).

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

28242740 is a wasteful number, since it uses less digits than its factorization.

28242740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74351 (or 74349 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 28242740 is about 5314.3898991324. The cubic root of 28242740 is about 304.5338754719.

It can be divided in two parts, 28242 and 740, that added together give a palindrome (28982).

The spelling of 28242740 in words is "twenty-eight million, two hundred forty-two thousand, seven hundred forty".