75899991 has 4 divisors (see below), whose sum is σ = 101199992. Its totient is φ = 50599992.

The previous prime is 75899981. The next prime is 75900049. The reversal of 75899991 is 19999857.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 75899991 - 2¹⁰ = 75898967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75899911) 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 3 ways as a sum of consecutive naturals, for example, 12649996 + ... + 12650001.

It is an arithmetic number, because the mean of its divisors is an integer number (25299998).

Almost surely, 2^75899991 is an apocalyptic number.

75899991 is a deficient number, since it is larger than the sum of its proper divisors (25300001).

75899991 is a wasteful number, since it uses less digits than its factorization.

75899991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25300000.

The product of its digits is 1837080, while the sum is 57.

The square root of 75899991 is about 8712.0600893245. The cubic root of 75899991 is about 423.3964784115.

The spelling of 75899991 in words is "seventy-five million, eight hundred ninety-nine thousand, nine hundred ninety-one".