28485720 has 96 divisors (see below), whose sum is σ = 94039920. Its totient is φ = 7476480.

The previous prime is 28485701. The next prime is 28485757. The reversal of 28485720 is 2758482.

It is a happy number.

28485720 is a `hidden beast` number, since 2 + 84 + 8 + 572 + 0 = 666.

It is a super-3 number, since 3×28485720³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 23530 + ... + 24710.

Almost surely, 2^28485720 is an apocalyptic number.

28485720 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 28485720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47019960).

28485720 is an abundant number, since it is smaller than the sum of its proper divisors (65554200).

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

28485720 is a wasteful number, since it uses less digits than its factorization.

28485720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1265 (or 1258 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 28485720 is about 5337.2015139022. The cubic root of 28485720 is about 305.4047122245.

The spelling of 28485720 in words is "twenty-eight million, four hundred eighty-five thousand, seven hundred twenty".