28035720 has 160 divisors (see below), whose sum is σ = 99970200. Its totient is φ = 7022592.

The previous prime is 28035719. The next prime is 28035727. The reversal of 28035720 is 2753082.

It can be written as a sum of positive squares in 4 ways, for example, as 27436644 + 599076 = 5238^2 + 774^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28035727) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 54826 + ... + 55334.

Almost surely, 2^28035720 is an apocalyptic number.

28035720 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 28035720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49985100).

28035720 is an abundant number, since it is smaller than the sum of its proper divisors (71934480).

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

28035720 is a wasteful number, since it uses less digits than its factorization.

28035720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549 (or 536 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 28035720 is about 5294.8767691043. The cubic root of 28035720 is about 303.7879696476.

The spelling of 28035720 in words is "twenty-eight million, thirty-five thousand, seven hundred twenty".