28707320 has 16 divisors (see below), whose sum is σ = 64591560. Its totient is φ = 11482912.

The previous prime is 28707317. The next prime is 28707337. The reversal of 28707320 is 2370782.

It is a super-2 number, since 2×28707320² = 1648220443164800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 358802 + ... + 358881.

Almost surely, 2^28707320 is an apocalyptic number.

28707320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28707320 is an abundant number, since it is smaller than the sum of its proper divisors (35884240).

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

28707320 is a wasteful number, since it uses less digits than its factorization.

28707320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717694 (or 717690 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 28707320 is about 5357.9212386895. The cubic root of 28707320 is about 306.1946161127.

The spelling of 28707320 in words is "twenty-eight million, seven hundred seven thousand, three hundred twenty".