28856497 has 16 divisors (see below), whose sum is σ = 32961600. Its totient is φ = 25090560.

The previous prime is 28856491. The next prime is 28856501. The reversal of 28856497 is 79465882.

It is a cyclic number.

It is not a de Polignac number, because 28856497 - 2³ = 28856489 is a prime.

It is a super-2 number, since 2×28856497² = 1665394838222018, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28856497.

It is not an unprimeable number, because it can be changed into a prime (28856491) 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 15 ways as a sum of consecutive naturals, for example, 12154 + ... + 14332.

It is an arithmetic number, because the mean of its divisors is an integer number (2060100).

Almost surely, 2^28856497 is an apocalyptic number.

It is an amenable number.

28856497 is a deficient number, since it is larger than the sum of its proper divisors (4105103).

28856497 is a wasteful number, since it uses less digits than its factorization.

28856497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256.

The product of its digits is 967680, while the sum is 49.

The square root of 28856497 is about 5371.8243642174. The cubic root of 28856497 is about 306.7240780719.

The spelling of 28856497 in words is "twenty-eight million, eight hundred fifty-six thousand, four hundred ninety-seven".