28116720 has 100 divisors (see below), whose sum is σ = 97676040. Its totient is φ = 7496064.

The previous prime is 28116719. The next prime is 28116727. The reversal of 28116720 is 2761182.

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 (28116727) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4311 + ... + 8649.

Almost surely, 2^28116720 is an apocalyptic number.

28116720 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 28116720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48838020).

28116720 is an abundant number, since it is smaller than the sum of its proper divisors (69559320).

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

28116720 is a wasteful number, since it uses less digits than its factorization.

28116720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4364 (or 4349 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 28116720 is about 5302.5201555487. The cubic root of 28116720 is about 304.0802535118.

The spelling of 28116720 in words is "twenty-eight million, one hundred sixteen thousand, seven hundred twenty".