28075771 has 4 divisors (see below), whose sum is σ = 28141344. Its totient is φ = 28010200.

The previous prime is 28075769. The next prime is 28075781. The reversal of 28075771 is 17757082.

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

It is a cyclic number.

It is not a de Polignac number, because 28075771 - 2¹ = 28075769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28075771.

It is not an unprimeable number, because it can be changed into a prime (28075781) 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, 32140 + ... + 33001.

It is an arithmetic number, because the mean of its divisors is an integer number (7035336).

Almost surely, 2^28075771 is an apocalyptic number.

28075771 is a deficient number, since it is larger than the sum of its proper divisors (65573).

28075771 is an equidigital number, since it uses as much as digits as its factorization.

28075771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65572.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 28075771 is about 5298.6574714733. The cubic root of 28075771 is about 303.9325616509.

The spelling of 28075771 in words is "twenty-eight million, seventy-five thousand, seven hundred seventy-one".