28265511 has 8 divisors (see below), whose sum is σ = 37959040. Its totient is φ = 18707832.

The previous prime is 28265507. The next prime is 28265533. The reversal of 28265511 is 11556282.

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

It is not a de Polignac number, because 28265511 - 2² = 28265507 is a prime.

It is a super-2 number, since 2×28265511² = 1597878224182242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28265561) 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, 33475 + ... + 34308.

It is an arithmetic number, because the mean of its divisors is an integer number (4744880).

Almost surely, 2^28265511 is an apocalyptic number.

28265511 is a deficient number, since it is larger than the sum of its proper divisors (9693529).

28265511 is a wasteful number, since it uses less digits than its factorization.

28265511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67925.

The product of its digits is 4800, while the sum is 30.

The square root of 28265511 is about 5316.5318582700. The cubic root of 28265511 is about 304.6156980103.

The spelling of 28265511 in words is "twenty-eight million, two hundred sixty-five thousand, five hundred eleven".