28397418 has 16 divisors (see below), whose sum is σ = 64908480. Its totient is φ = 8113536.

The previous prime is 28397417. The next prime is 28397423. The reversal of 28397418 is 81479382.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 676129 = 28397418 / (2 + 8 + 3 + 9 + 7 + 4 + 1 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 28397418.

It is not an unprimeable number, because it can be changed into a prime (28397417) 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, 338023 + ... + 338106.

It is an arithmetic number, because the mean of its divisors is an integer number (4056780).

Almost surely, 2^28397418 is an apocalyptic number.

28397418 is an abundant number, since it is smaller than the sum of its proper divisors (36511062).

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

28397418 is a wasteful number, since it uses less digits than its factorization.

28397418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676141.

The product of its digits is 96768, while the sum is 42.

The square root of 28397418 is about 5328.9227804501. The cubic root of 28397418 is about 305.0888140530.

The spelling of 28397418 in words is "twenty-eight million, three hundred ninety-seven thousand, four hundred eighteen".