28840025 has 12 divisors (see below), whose sum is σ = 35836992. Its totient is φ = 23023440.

The previous prime is 28840001. The next prime is 28840027. The reversal of 28840025 is 52004882.

It is a de Polignac number, because none of the positive numbers 2^k-28840025 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 28840025.

It is not an unprimeable number, because it can be changed into a prime (28840027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15284 + ... + 17066.

It is an arithmetic number, because the mean of its divisors is an integer number (2986416).

Almost surely, 2^28840025 is an apocalyptic number.

28840025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28840025 is a deficient number, since it is larger than the sum of its proper divisors (6996967).

28840025 is a wasteful number, since it uses less digits than its factorization.

28840025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2440 (or 2435 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 28840025 is about 5370.2909604601. The cubic root of 28840025 is about 306.6657050747.

The spelling of 28840025 in words is "twenty-eight million, eight hundred forty thousand, twenty-five".