28493889 has 8 divisors (see below), whose sum is σ = 38039520. Its totient is φ = 18972096.

The previous prime is 28493837. The next prime is 28493897. The reversal of 28493889 is 98839482.

It is a happy number.

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

It is not a de Polignac number, because 28493889 - 2⁷ = 28493761 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28493809) 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, 2952 + ... + 8105.

It is an arithmetic number, because the mean of its divisors is an integer number (4754940).

Almost surely, 2^28493889 is an apocalyptic number.

It is an amenable number.

28493889 is a deficient number, since it is larger than the sum of its proper divisors (9545631).

28493889 is a wasteful number, since it uses less digits than its factorization.

28493889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11919.

The product of its digits is 995328, while the sum is 51.

The square root of 28493889 is about 5337.9667477421. The cubic root of 28493889 is about 305.4339036070.

The spelling of 28493889 in words is "twenty-eight million, four hundred ninety-three thousand, eight hundred eighty-nine".