28197418 has 8 divisors (see below), whose sum is σ = 42875748. Its totient is φ = 13905504.

The previous prime is 28197397. The next prime is 28197439. The reversal of 28197418 is 81479182.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28197397) and next prime (28197439).

It can be written as a sum of positive squares in 2 ways, for example, as 25431849 + 2765569 = 5043^2 + 1663^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96421 + ... + 96712.

Almost surely, 2^28197418 is an apocalyptic number.

28197418 is a deficient number, since it is larger than the sum of its proper divisors (14678330).

28197418 is a wasteful number, since it uses less digits than its factorization.

28197418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193208.

The product of its digits is 32256, while the sum is 40.

The square root of 28197418 is about 5310.1241040111. The cubic root of 28197418 is about 304.3708899428.

The spelling of 28197418 in words is "twenty-eight million, one hundred ninety-seven thousand, four hundred eighteen".