28480725 has 108 divisors (see below), whose sum is σ = 63719136. Its totient is φ = 11905920.

The previous prime is 28480721. The next prime is 28480733. The reversal of 28480725 is 52708482.

It is a happy number.

It is not a de Polignac number, because 28480725 - 2² = 28480721 is a prime.

It is a super-2 number, since 2×28480725² = 1622303393051250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28480725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28480721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 266122 + ... + 266228.

It is an arithmetic number, because the mean of its divisors is an integer number (589992).

Almost surely, 2^28480725 is an apocalyptic number.

28480725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28480725 is an abundant number, since it is smaller than the sum of its proper divisors (35238411).

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

28480725 is a wasteful number, since it uses less digits than its factorization.

28480725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 135 counting only the distinct ones).

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

The square root of 28480725 is about 5336.7335515276. The cubic root of 28480725 is about 305.3868601719.

The spelling of 28480725 in words is "twenty-eight million, four hundred eighty thousand, seven hundred twenty-five".