28777217 has 8 divisors (see below), whose sum is σ = 32928000. Its totient is φ = 24636384.

The previous prime is 28777213. The next prime is 28777241. The reversal of 28777217 is 71277782.

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

It is a cyclic number.

It is not a de Polignac number, because 28777217 - 2² = 28777213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28777211) 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, 5384 + ... + 9302.

It is an arithmetic number, because the mean of its divisors is an integer number (4116000).

Almost surely, 2^28777217 is an apocalyptic number.

It is an amenable number.

28777217 is a deficient number, since it is larger than the sum of its proper divisors (4150783).

28777217 is a wasteful number, since it uses less digits than its factorization.

28777217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4975.

The product of its digits is 76832, while the sum is 41.

The square root of 28777217 is about 5364.4400453356. The cubic root of 28777217 is about 306.4429237279.

The spelling of 28777217 in words is "twenty-eight million, seven hundred seventy-seven thousand, two hundred seventeen".