28118431 has 8 divisors (see below), whose sum is σ = 31388544. Its totient is φ = 24967320.

The previous prime is 28118411. The next prime is 28118471. The reversal of 28118431 is 13481182.

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

It is a cyclic number.

It is not a de Polignac number, because 28118431 - 2⁵ = 28118399 is a prime.

It is a super-2 number, since 2×28118431² = 1581292323803522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28118431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28118411) 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, 29251 + ... + 30196.

It is an arithmetic number, because the mean of its divisors is an integer number (3923568).

Almost surely, 2^28118431 is an apocalyptic number.

28118431 is a deficient number, since it is larger than the sum of its proper divisors (3270113).

28118431 is a wasteful number, since it uses less digits than its factorization.

28118431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59501.

The product of its digits is 1536, while the sum is 28.

The square root of 28118431 is about 5302.6814914720. The cubic root of 28118431 is about 304.0864214996.

The spelling of 28118431 in words is "twenty-eight million, one hundred eighteen thousand, four hundred thirty-one".