28718377 has 4 divisors (see below), whose sum is σ = 28743876. Its totient is φ = 28692880.

The previous prime is 28718353. The next prime is 28718387. The reversal of 28718377 is 77381782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23386896 + 5331481 = 4836^2 + 2309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28718377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28718387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10978 + ... + 13339.

It is an arithmetic number, because the mean of its divisors is an integer number (7185969).

Almost surely, 2^28718377 is an apocalyptic number.

It is an amenable number.

28718377 is a deficient number, since it is larger than the sum of its proper divisors (25499).

28718377 is a wasteful number, since it uses less digits than its factorization.

28718377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25498.

The product of its digits is 131712, while the sum is 43.

The square root of 28718377 is about 5358.9529760952. The cubic root of 28718377 is about 306.2339226879.

The spelling of 28718377 in words is "twenty-eight million, seven hundred eighteen thousand, three hundred seventy-seven".