28057651 has 4 divisors (see below), whose sum is σ = 28149352. Its totient is φ = 27965952.

The previous prime is 28057643. The next prime is 28057681. The reversal of 28057651 is 15675082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15675082 = 2 ⋅7837541.

It is a cyclic number.

It is not a de Polignac number, because 28057651 - 2³ = 28057643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28057681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45390 + ... + 46003.

It is an arithmetic number, because the mean of its divisors is an integer number (7037338).

Almost surely, 2^28057651 is an apocalyptic number.

28057651 is a deficient number, since it is larger than the sum of its proper divisors (91701).

28057651 is an equidigital number, since it uses as much as digits as its factorization.

28057651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91700.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 28057651 is about 5296.9473284147. The cubic root of 28057651 is about 303.8671619245.

The spelling of 28057651 in words is "twenty-eight million, fifty-seven thousand, six hundred fifty-one".