28710720 has 112 divisors (see below), whose sum is σ = 101315520. Its totient is φ = 7653888.

The previous prime is 28710707. The next prime is 28710727. The reversal of 28710720 is 2701782.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28710727) 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 15 ways as a sum of consecutive naturals, for example, 6979 + ... + 10301.

Almost surely, 2^28710720 is an apocalyptic number.

28710720 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 28710720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50657760).

28710720 is an abundant number, since it is smaller than the sum of its proper divisors (72604800).

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

28710720 is a wasteful number, since it uses less digits than its factorization.

28710720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3349 (or 3333 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 28710720 is about 5358.2385165276. The cubic root of 28710720 is about 306.2067038612.

The spelling of 28710720 in words is "twenty-eight million, seven hundred ten thousand, seven hundred twenty".