28265997 has 8 divisors (see below), whose sum is σ = 38306080. Its totient is φ = 18534960.

The previous prime is 28265983. The next prime is 28266059. The reversal of 28265997 is 79956282.

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

It is a de Polignac number, because none of the positive numbers 2^k-28265997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28265927) 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, 77047 + ... + 77412.

It is an arithmetic number, because the mean of its divisors is an integer number (4788260).

Almost surely, 2^28265997 is an apocalyptic number.

It is an amenable number.

28265997 is a deficient number, since it is larger than the sum of its proper divisors (10040083).

28265997 is a wasteful number, since it uses less digits than its factorization.

28265997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154523.

The product of its digits is 544320, while the sum is 48.

The square root of 28265997 is about 5316.5775645616. The cubic root of 28265997 is about 304.6174438645.

The spelling of 28265997 in words is "twenty-eight million, two hundred sixty-five thousand, nine hundred ninety-seven".