28712140 has 12 divisors (see below), whose sum is σ = 60295536. Its totient is φ = 11484848.

The previous prime is 28712129. The next prime is 28712149. The reversal of 28712140 is 4121782.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28712149) 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 3 ways as a sum of consecutive naturals, for example, 717784 + ... + 717823.

It is an arithmetic number, because the mean of its divisors is an integer number (5024628).

Almost surely, 2^28712140 is an apocalyptic number.

28712140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28712140 is an abundant number, since it is smaller than the sum of its proper divisors (31583396).

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

28712140 is a wasteful number, since it uses less digits than its factorization.

28712140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435616 (or 1435614 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 28712140 is about 5358.3710211220. The cubic root of 28712140 is about 306.2117519914.

The spelling of 28712140 in words is "twenty-eight million, seven hundred twelve thousand, one hundred forty".