28745549 has 8 divisors (see below), whose sum is σ = 33171840. Its totient is φ = 24399216.

The previous prime is 28745533. The next prime is 28745569. The reversal of 28745549 is 94554782.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28745549 - 2⁴ = 28745533 is a prime.

It is a super-2 number, since 2×28745549² = 1652613174622802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28745569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19214 + ... + 20655.

It is an arithmetic number, because the mean of its divisors is an integer number (4146480).

Almost surely, 2^28745549 is an apocalyptic number.

It is an amenable number.

28745549 is a deficient number, since it is larger than the sum of its proper divisors (4426291).

28745549 is a wasteful number, since it uses less digits than its factorization.

28745549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39979.

The product of its digits is 403200, while the sum is 44.

The square root of 28745549 is about 5361.4875734259. The cubic root of 28745549 is about 306.3304737013.

The spelling of 28745549 in words is "twenty-eight million, seven hundred forty-five thousand, five hundred forty-nine".