28730825 has 6 divisors (see below), whose sum is σ = 35626254. Its totient is φ = 22984640.

The previous prime is 28730813. The next prime is 28730861. The reversal of 28730825 is 52803782.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 10163344 + 18567481 = 3188^2 + 4309^2 .

It is not a de Polignac number, because 28730825 - 2⁴ = 28730809 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, 574592 + ... + 574641.

It is an arithmetic number, because the mean of its divisors is an integer number (5937709).

Almost surely, 2^28730825 is an apocalyptic number.

28730825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28730825 is a deficient number, since it is larger than the sum of its proper divisors (6895429).

28730825 is a wasteful number, since it uses less digits than its factorization.

28730825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149243 (or 1149238 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 28730825 is about 5360.1142711700. The cubic root of 28730825 is about 306.2781620638.

The spelling of 28730825 in words is "twenty-eight million, seven hundred thirty thousand, eight hundred twenty-five".