28495921 has 8 divisors (see below), whose sum is σ = 29023488. Its totient is φ = 27972000.

The previous prime is 28495897. The next prime is 28495933. The reversal of 28495921 is 12959482.

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 28495921 - 2⁵ = 28495889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28495021) 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, 18501 + ... + 19981.

It is an arithmetic number, because the mean of its divisors is an integer number (3627936).

Almost surely, 2^28495921 is an apocalyptic number.

It is an amenable number.

28495921 is a deficient number, since it is larger than the sum of its proper divisors (527567).

28495921 is a wasteful number, since it uses less digits than its factorization.

28495921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823.

The product of its digits is 51840, while the sum is 40.

The square root of 28495921 is about 5338.1570789927. The cubic root of 28495921 is about 305.4411639584.

The spelling of 28495921 in words is "twenty-eight million, four hundred ninety-five thousand, nine hundred twenty-one".