28719645 has 16 divisors (see below), whose sum is σ = 46189440. Its totient is φ = 15237824.

The previous prime is 28719631. The next prime is 28719661. The reversal of 28719645 is 54691782.

It is a cyclic number.

It is not a de Polignac number, because 28719645 - 2⁸ = 28719389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28719597 and 28719606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1905 + ... + 7814.

It is an arithmetic number, because the mean of its divisors is an integer number (2886840).

Almost surely, 2^28719645 is an apocalyptic number.

It is an amenable number.

28719645 is a deficient number, since it is larger than the sum of its proper divisors (17469795).

28719645 is a wasteful number, since it uses less digits than its factorization.

28719645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9924.

The product of its digits is 120960, while the sum is 42.

The square root of 28719645 is about 5359.0712814815. The cubic root of 28719645 is about 306.2384296614.

The spelling of 28719645 in words is "twenty-eight million, seven hundred nineteen thousand, six hundred forty-five".