28118477 has 4 divisors (see below), whose sum is σ = 28132416. Its totient is φ = 28104540.

The previous prime is 28118473. The next prime is 28118479. The reversal of 28118477 is 77481182.

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 28118477 - 2² = 28118473 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 28118477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28118471) 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, 3299 + ... + 8192.

It is an arithmetic number, because the mean of its divisors is an integer number (7033104).

Almost surely, 2^28118477 is an apocalyptic number.

It is an amenable number.

28118477 is a deficient number, since it is larger than the sum of its proper divisors (13939).

28118477 is a wasteful number, since it uses less digits than its factorization.

28118477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13938.

The product of its digits is 25088, while the sum is 38.

The square root of 28118477 is about 5302.6858288984. The cubic root of 28118477 is about 304.0865873217.

The spelling of 28118477 in words is "twenty-eight million, one hundred eighteen thousand, four hundred seventy-seven".