28316431 has 8 divisors (see below), whose sum is σ = 33267024. Its totient is φ = 23761920.

The previous prime is 28316429. The next prime is 28316437. The reversal of 28316431 is 13461382.

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

It is not a de Polignac number, because 28316431 - 2¹ = 28316429 is a prime.

It is a super-2 number, since 2×28316431² = 1603640529155522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28316431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28316437) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 98866 + ... + 99151.

It is an arithmetic number, because the mean of its divisors is an integer number (4158378).

Almost surely, 2^28316431 is an apocalyptic number.

28316431 is a deficient number, since it is larger than the sum of its proper divisors (4950593).

28316431 is a wasteful number, since it uses less digits than its factorization.

28316431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198041.

The product of its digits is 3456, while the sum is 28.

The square root of 28316431 is about 5321.3185396103. The cubic root of 28316431 is about 304.7985088610.

The spelling of 28316431 in words is "twenty-eight million, three hundred sixteen thousand, four hundred thirty-one".