75789991 has 8 divisors (see below), whose sum is σ = 80769024. Its totient is φ = 70951320.

The previous prime is 75789983. The next prime is 75790003. The reversal of 75789991 is 19998757.

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

It is not a de Polignac number, because 75789991 - 2³ = 75789983 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 (75789911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33975 + ... + 36136.

It is an arithmetic number, because the mean of its divisors is an integer number (10096128).

Almost surely, 2^75789991 is an apocalyptic number.

75789991 is a deficient number, since it is larger than the sum of its proper divisors (4979033).

75789991 is a wasteful number, since it uses less digits than its factorization.

75789991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70181.

The product of its digits is 1428840, while the sum is 55.

The square root of 75789991 is about 8705.7447125447. The cubic root of 75789991 is about 423.1918401347.

The spelling of 75789991 in words is "seventy-five million, seven hundred eighty-nine thousand, nine hundred ninety-one".