28330720 has 48 divisors (see below), whose sum is σ = 73020528. Its totient is φ = 10301440.

The previous prime is 28330697. The next prime is 28330739. The reversal of 28330720 is 2703382.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6289 + ... + 9808.

It is an arithmetic number, because the mean of its divisors is an integer number (1521261).

Almost surely, 2^28330720 is an apocalyptic number.

28330720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28330720 is an abundant number, since it is smaller than the sum of its proper divisors (44689808).

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

28330720 is a wasteful number, since it uses less digits than its factorization.

28330720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16123 (or 16115 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 28330720 is about 5322.6609886409. The cubic root of 28330720 is about 304.8497692466.

The spelling of 28330720 in words is "twenty-eight million, three hundred thirty thousand, seven hundred twenty".