28805277 has 8 divisors (see below), whose sum is σ = 39445216. Its totient is φ = 18684432.

The previous prime is 28805267. The next prime is 28805281. The reversal of 28805277 is 77250882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-28805277 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 (28805267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129643 + ... + 129864.

It is an arithmetic number, because the mean of its divisors is an integer number (4930652).

Almost surely, 2^28805277 is an apocalyptic number.

It is an amenable number.

28805277 is a deficient number, since it is larger than the sum of its proper divisors (10639939).

28805277 is a wasteful number, since it uses less digits than its factorization.

28805277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259547.

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 28805277 is about 5367.0547789267. The cubic root of 28805277 is about 306.5424931793.

The spelling of 28805277 in words is "twenty-eight million, eight hundred five thousand, two hundred seventy-seven".