28816925 has 6 divisors (see below), whose sum is σ = 35733018. Its totient is φ = 23053520.

The previous prime is 28816897. The next prime is 28816927. The reversal of 28816925 is 52961882.

It can be written as a sum of positive squares in 3 ways, for example, as 3786916 + 25030009 = 1946^2 + 5003^2 .

It is not a de Polignac number, because 28816925 - 2²² = 24622621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28816927) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 576314 + ... + 576363.

It is an arithmetic number, because the mean of its divisors is an integer number (5955503).

Almost surely, 2^28816925 is an apocalyptic number.

28816925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28816925 is a deficient number, since it is larger than the sum of its proper divisors (6916093).

28816925 is a wasteful number, since it uses less digits than its factorization.

28816925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152687 (or 1152682 counting only the distinct ones).

The product of its digits is 69120, while the sum is 41.

The square root of 28816925 is about 5368.1398081645. The cubic root of 28816925 is about 306.5838065098.

The spelling of 28816925 in words is "twenty-eight million, eight hundred sixteen thousand, nine hundred twenty-five".