28976645 has 4 divisors (see below), whose sum is σ = 34771980. Its totient is φ = 23181312.

The previous prime is 28976639. The next prime is 28976659. The reversal of 28976645 is 54667982.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9138529 + 19838116 = 3023^2 + 4454^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28976645 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28976645.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2897660 + ... + 2897669.

It is an arithmetic number, because the mean of its divisors is an integer number (8692995).

Almost surely, 2^28976645 is an apocalyptic number.

It is an amenable number.

28976645 is a deficient number, since it is larger than the sum of its proper divisors (5795335).

28976645 is an equidigital number, since it uses as much as digits as its factorization.

28976645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5795334.

The product of its digits is 725760, while the sum is 47.

The square root of 28976645 is about 5382.9959130581. The cubic root of 28976645 is about 307.1491846027.

The spelling of 28976645 in words is "twenty-eight million, nine hundred seventy-six thousand, six hundred forty-five".