28141720 has 32 divisors (see below), whose sum is σ = 64670400. Its totient is φ = 11016448.

The previous prime is 28141709. The next prime is 28141721. The reversal of 28141720 is 2714182.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28141721) 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, 5605 + ... + 9364.

It is an arithmetic number, because the mean of its divisors is an integer number (2020950).

Almost surely, 2^28141720 is an apocalyptic number.

28141720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28141720 is an abundant number, since it is smaller than the sum of its proper divisors (36528680).

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

28141720 is a wasteful number, since it uses less digits than its factorization.

28141720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15027 (or 15023 counting only the distinct ones).

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

The square root of 28141720 is about 5304.8770014016. The cubic root of 28141720 is about 304.1703511991.

The spelling of 28141720 in words is "twenty-eight million, one hundred forty-one thousand, seven hundred twenty".