28550725 has 12 divisors (see below), whose sum is σ = 40460704. Its totient is φ = 19577520.

The previous prime is 28550707. The next prime is 28550737. The reversal of 28550725 is 52705582.

It is not a de Polignac number, because 28550725 - 2¹⁹ = 28026437 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 81399 + ... + 81748.

Almost surely, 2^28550725 is an apocalyptic number.

28550725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28550725 is a deficient number, since it is larger than the sum of its proper divisors (11909979).

28550725 is a wasteful number, since it uses less digits than its factorization.

28550725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163164 (or 163159 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 34.

The square root of 28550725 is about 5343.2878455123. The cubic root of 28550725 is about 305.6368490157.

The spelling of 28550725 in words is "twenty-eight million, five hundred fifty thousand, seven hundred twenty-five".