28897745 has 8 divisors (see below), whose sum is σ = 34732584. Its totient is φ = 23081344.

The previous prime is 28897741. The next prime is 28897751. The reversal of 28897745 is 54779882.

It can be written as a sum of positive squares in 4 ways, for example, as 17581249 + 11316496 = 4193^2 + 3364^2 .

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 28897745 - 2² = 28897741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28897693 and 28897702.

It is not an unprimeable number, because it can be changed into a prime (28897741) 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, 884 + ... + 7653.

It is an arithmetic number, because the mean of its divisors is an integer number (4341573).

Almost surely, 2^28897745 is an apocalyptic number.

It is an amenable number.

28897745 is a deficient number, since it is larger than the sum of its proper divisors (5834839).

28897745 is an equidigital number, since it uses as much as digits as its factorization.

28897745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9219.

The product of its digits is 1128960, while the sum is 50.

The square root of 28897745 is about 5375.6622847794. The cubic root of 28897745 is about 306.8701541455.

The spelling of 28897745 in words is "twenty-eight million, eight hundred ninety-seven thousand, seven hundred forty-five".