28888657 has 8 divisors (see below), whose sum is σ = 33638976. Its totient is φ = 24294192.

The previous prime is 28888649. The next prime is 28888663. The reversal of 28888657 is 75688882.

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 28888657 - 2³ = 28888649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28882657) 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 7 ways as a sum of consecutive naturals, for example, 38563 + ... + 39304.

It is an arithmetic number, because the mean of its divisors is an integer number (4204872).

Almost surely, 2^28888657 is an apocalyptic number.

It is an amenable number.

28888657 is a deficient number, since it is larger than the sum of its proper divisors (4750319).

28888657 is an equidigital number, since it uses as much as digits as its factorization.

28888657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77927.

The product of its digits is 1720320, while the sum is 52.

The square root of 28888657 is about 5374.8169271148. The cubic root of 28888657 is about 306.8379817578.

The spelling of 28888657 in words is "twenty-eight million, eight hundred eighty-eight thousand, six hundred fifty-seven".