28325661 has 32 divisors (see below), whose sum is σ = 47996928. Its totient is φ = 14454720.

The previous prime is 28325653. The next prime is 28325669. The reversal of 28325661 is 16652382.

It is an interprime number because it is at equal distance from previous prime (28325653) and next prime (28325669).

It is not a de Polignac number, because 28325661 - 2³ = 28325653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28325669) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 6790 + ... + 10136.

It is an arithmetic number, because the mean of its divisors is an integer number (1499904).

Almost surely, 2^28325661 is an apocalyptic number.

28325661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28325661 is a deficient number, since it is larger than the sum of its proper divisors (19671267).

28325661 is a wasteful number, since it uses less digits than its factorization.

28325661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3401.

The product of its digits is 17280, while the sum is 33.

The square root of 28325661 is about 5322.1857352032. The cubic root of 28325661 is about 304.8316225518.

The spelling of 28325661 in words is "twenty-eight million, three hundred twenty-five thousand, six hundred sixty-one".