75999 has 24 divisors (see below), whose sum is σ = 131328. Its totient is φ = 38640.

The previous prime is 75997. The next prime is 76001. The reversal of 75999 is 99957.

It is an interprime number because it is at equal distance from previous prime (75997) and next prime (76001).

It is not a de Polignac number, because 75999 - 2¹ = 75997 is a prime.

It is a d-powerful number, because it can be written as 7⁵ + 5³ + 9 + 9 + 9⁵ .

75999 is a modest number, since divided by 999 gives 75 as remainder.

It is a plaindrome in base 16.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1594 + ... + 1640.

It is an arithmetic number, because the mean of its divisors is an integer number (5472).

2⁷⁵⁹⁹⁹ is an apocalyptic number.

75999 is a deficient number, since it is larger than the sum of its proper divisors (55329).

75999 is a wasteful number, since it uses less digits than its factorization.

75999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75 (or 68 counting only the distinct ones).

The product of its digits is 25515, while the sum is 39.

The square root of 75999 is about 275.6791613452. The cubic root of 75999 is about 42.3580500600.

It can be divided in two parts, 759 and 99, that added together give a palindrome (858).

The spelling of 75999 in words is "seventy-five thousand, nine hundred ninety-nine".