28777471 has 8 divisors (see below), whose sum is σ = 29067264. Its totient is φ = 28489560.

The previous prime is 28777459. The next prime is 28777499. The reversal of 28777471 is 17477782.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28777471 is a prime.

It is a super-3 number, since 3×28777471³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28777451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74946 + ... + 75328.

It is an arithmetic number, because the mean of its divisors is an integer number (3633408).

Almost surely, 2^28777471 is an apocalyptic number.

28777471 is a deficient number, since it is larger than the sum of its proper divisors (289793).

28777471 is a wasteful number, since it uses less digits than its factorization.

28777471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941.

The product of its digits is 153664, while the sum is 43.

The square root of 28777471 is about 5364.4637197021. The cubic root of 28777471 is about 306.4438253239.

The spelling of 28777471 in words is "twenty-eight million, seven hundred seventy-seven thousand, four hundred seventy-one".