28290277 has 4 divisors (see below), whose sum is σ = 28369440. Its totient is φ = 28211116.

The previous prime is 28290271. The next prime is 28290307. The reversal of 28290277 is 77209282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28290277 - 2¹⁹ = 27765989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28290271) 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, 39043 + ... + 39760.

It is an arithmetic number, because the mean of its divisors is an integer number (7092360).

Almost surely, 2^28290277 is an apocalyptic number.

It is an amenable number.

28290277 is a deficient number, since it is larger than the sum of its proper divisors (79163).

28290277 is an equidigital number, since it uses as much as digits as its factorization.

28290277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79162.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 28290277 is about 5318.8604982646. The cubic root of 28290277 is about 304.7046392655.

The spelling of 28290277 in words is "twenty-eight million, two hundred ninety thousand, two hundred seventy-seven".