28051689 has 8 divisors (see below), whose sum is σ = 37426752. Its totient is φ = 18688880.

The previous prime is 28051607. The next prime is 28051691. The reversal of 28051689 is 98615082.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28051689 is a prime.

It is a super-4 number, since 4×28051689⁴ (a number of 31 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (28051189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7099 + ... + 10319.

It is an arithmetic number, because the mean of its divisors is an integer number (4678344).

Almost surely, 2^28051689 is an apocalyptic number.

It is an amenable number.

28051689 is a deficient number, since it is larger than the sum of its proper divisors (9375063).

28051689 is a wasteful number, since it uses less digits than its factorization.

28051689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6127.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 28051689 is about 5296.3845215392. The cubic root of 28051689 is about 303.8456373814.

The spelling of 28051689 in words is "twenty-eight million, fifty-one thousand, six hundred eighty-nine".