28489025 has 12 divisors (see below), whose sum is σ = 37404972. Its totient is φ = 21450240.

The previous prime is 28489007. The next prime is 28489057. The reversal of 28489025 is 52098482.

It can be written as a sum of positive squares in 6 ways, for example, as 2611456 + 25877569 = 1616^2 + 5087^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28489025 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28489025.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33092 + ... + 33941.

It is an arithmetic number, because the mean of its divisors is an integer number (3117081).

Almost surely, 2^28489025 is an apocalyptic number.

28489025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28489025 is a deficient number, since it is larger than the sum of its proper divisors (8915947).

28489025 is a wasteful number, since it uses less digits than its factorization.

28489025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67060 (or 67055 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 28489025 is about 5337.5111241102. The cubic root of 28489025 is about 305.4165230960.

The spelling of 28489025 in words is "twenty-eight million, four hundred eighty-nine thousand, twenty-five".