28890625 has 21 divisors (see below), whose sum is σ = 36972183. Its totient is φ = 22575000.

The previous prime is 28890611. The next prime is 28890643. The reversal of 28890625 is 52609882.

The square root of 28890625 is 5375.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 3 ways, for example, as 25310961 + 3579664 = 5031^2 + 1892^2 .

It is not a de Polignac number, because 28890625 - 2⁵ = 28890593 is a prime.

It is a Duffinian 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 20 ways as a sum of consecutive naturals, for example, 671854 + ... + 671896.

Almost surely, 2^28890625 is an apocalyptic number.

28890625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28890625 is the 5375-th square number.

28890625 is the 2688-th centered octagonal number.

It is an amenable number.

28890625 is a deficient number, since it is larger than the sum of its proper divisors (8081558).

28890625 is an frugal number, since it uses more digits than its factorization.

28890625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The cubic root of 28890625 is about 306.8449492380.

The spelling of 28890625 in words is "twenty-eight million, eight hundred ninety thousand, six hundred twenty-five".