28450689 has 8 divisors (see below), whose sum is σ = 37963680. Its totient is φ = 18952416.

The previous prime is 28450663. The next prime is 28450699. The reversal of 28450689 is 98605482.

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

It is not a de Polignac number, because 28450689 - 2¹³ = 28442497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28450689.

It is not an unprimeable number, because it can be changed into a prime (28450699) 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, 2157 + ... + 7845.

It is an arithmetic number, because the mean of its divisors is an integer number (4745460).

Almost surely, 2^28450689 is an apocalyptic number.

It is an amenable number.

28450689 is a deficient number, since it is larger than the sum of its proper divisors (9512991).

28450689 is a wasteful number, since it uses less digits than its factorization.

28450689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7359.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 28450689 is about 5333.9187282897. The cubic root of 28450689 is about 305.2794679371.

The spelling of 28450689 in words is "twenty-eight million, four hundred fifty thousand, six hundred eighty-nine".