28077445 has 16 divisors (see below), whose sum is σ = 37068480. Its totient is φ = 20415120.

The previous prime is 28077433. The next prime is 28077463. The reversal of 28077445 is 54477082.

It is not a de Polignac number, because 28077445 - 2⁹ = 28076933 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4546 + ... + 8764.

It is an arithmetic number, because the mean of its divisors is an integer number (2316780).

Almost surely, 2^28077445 is an apocalyptic number.

It is an amenable number.

28077445 is a deficient number, since it is larger than the sum of its proper divisors (8991035).

28077445 is an equidigital number, since it uses as much as digits as its factorization.

28077445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4257 (or 4235 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 37.

The square root of 28077445 is about 5298.8154336606. The cubic root of 28077445 is about 303.9386021261.

The spelling of 28077445 in words is "twenty-eight million, seventy-seven thousand, four hundred forty-five".