28890025 has 6 divisors (see below), whose sum is σ = 35823662. Its totient is φ = 23112000.

The previous prime is 28889989. The next prime is 28890031. The reversal of 28890025 is 52009882.

28890025 is nontrivially palindromic in base 8.

It can be written as a sum of positive squares in 3 ways, for example, as 3164841 + 25725184 = 1779^2 + 5072^2 .

It is not a de Polignac number, because 28890025 - 2⁹ = 28889513 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 577776 + ... + 577825.

Almost surely, 2^28890025 is an apocalyptic number.

28890025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28890025 is a deficient number, since it is larger than the sum of its proper divisors (6933637).

28890025 is a wasteful number, since it uses less digits than its factorization.

28890025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155611 (or 1155606 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 28890025 is about 5374.9441857567. The cubic root of 28890025 is about 306.8428250398.

The spelling of 28890025 in words is "twenty-eight million, eight hundred ninety thousand, twenty-five".