75429991 has 8 divisors (see below), whose sum is σ = 92837024. Its totient is φ = 59680800.

The previous prime is 75429983. The next prime is 75430001. The reversal of 75429991 is 19992457.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 75429991 - 2³ = 75429983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75429691) 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 7 ways as a sum of consecutive naturals, for example, 414360 + ... + 414541.

It is an arithmetic number, because the mean of its divisors is an integer number (11604628).

Almost surely, 2^75429991 is an apocalyptic number.

75429991 is a deficient number, since it is larger than the sum of its proper divisors (17407033).

75429991 is a wasteful number, since it uses less digits than its factorization.

75429991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828921.

The product of its digits is 204120, while the sum is 46.

The square root of 75429991 is about 8685.0440989093. The cubic root of 75429991 is about 422.5207272490.

The spelling of 75429991 in words is "seventy-five million, four hundred twenty-nine thousand, nine hundred ninety-one".