28057797 has 12 divisors (see below), whose sum is σ = 40583244. Its totient is φ = 18679680.

The previous prime is 28057789. The next prime is 28057811. The reversal of 28057797 is 79775082.

It can be written as a sum of positive squares in 2 ways, for example, as 22268961 + 5788836 = 4719^2 + 2406^2 .

It is not a de Polignac number, because 28057797 - 2³ = 28057789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28057717) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6813 + ... + 10125.

It is an arithmetic number, because the mean of its divisors is an integer number (3381937).

Almost surely, 2^28057797 is an apocalyptic number.

It is an amenable number.

28057797 is a deficient number, since it is larger than the sum of its proper divisors (12525447).

28057797 is a wasteful number, since it uses less digits than its factorization.

28057797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4260 (or 4257 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 28057797 is about 5296.9611099195. The cubic root of 28057797 is about 303.8676889884.

The spelling of 28057797 in words is "twenty-eight million, fifty-seven thousand, seven hundred ninety-seven".