28702720 has 48 divisors (see below), whose sum is σ = 68894280. Its totient is φ = 11476992.

The previous prime is 28702717. The next prime is 28702727. The reversal of 28702720 is 2720782.

It is a super-2 number, since 2×28702720² = 1647692270796800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28702727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8839 + ... + 11641.

Almost surely, 2^28702720 is an apocalyptic number.

28702720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28702720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34447140).

28702720 is an abundant number, since it is smaller than the sum of its proper divisors (40191560).

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

28702720 is an equidigital number, since it uses as much as digits as its factorization.

28702720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2830 (or 2810 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 28702720 is about 5357.4919505306. The cubic root of 28702720 is about 306.1782605807.

The spelling of 28702720 in words is "twenty-eight million, seven hundred two thousand, seven hundred twenty".