28715418 has 32 divisors (see below), whose sum is σ = 64900800. Its totient is φ = 9408528.

The previous prime is 28715417. The next prime is 28715419. The reversal of 28715418 is 81451782.

It is an interprime number because it is at equal distance from previous prime (28715417) and next prime (28715419).

It is not an unprimeable number, because it can be changed into a prime (28715413) 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 15 ways as a sum of consecutive naturals, for example, 1321 + ... + 7692.

It is an arithmetic number, because the mean of its divisors is an integer number (2028150).

Almost surely, 2^28715418 is an apocalyptic number.

28715418 is an abundant number, since it is smaller than the sum of its proper divisors (36185382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28715418 is a wasteful number, since it uses less digits than its factorization.

28715418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9083 (or 9077 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 28715418 is about 5358.6768889344. The cubic root of 28715418 is about 306.2234047153.

The spelling of 28715418 in words is "twenty-eight million, seven hundred fifteen thousand, four hundred eighteen".