75423991 has 4 divisors (see below), whose sum is σ = 75445272. Its totient is φ = 75402712.

The previous prime is 75423989. The next prime is 75424003. The reversal of 75423991 is 19932457.

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

It is a cyclic number.

It is not a de Polignac number, because 75423991 - 2¹ = 75423989 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 (75423911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3901 + ... + 12886.

It is an arithmetic number, because the mean of its divisors is an integer number (18861318).

Almost surely, 2^75423991 is an apocalyptic number.

75423991 is a deficient number, since it is larger than the sum of its proper divisors (21281).

75423991 is a wasteful number, since it uses less digits than its factorization.

75423991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21280.

The product of its digits is 68040, while the sum is 40.

The square root of 75423991 is about 8684.6986706506. The cubic root of 75423991 is about 422.5095239616.

The spelling of 75423991 in words is "seventy-five million, four hundred twenty-three thousand, nine hundred ninety-one".