75663999 has 6 divisors (see below), whose sum is σ = 109292456. Its totient is φ = 50442660.

The previous prime is 75663953. The next prime is 75664007. The reversal of 75663999 is 99936657.

It is a de Polignac number, because none of the positive numbers 2^k-75663999 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 (75663949) 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 5 ways as a sum of consecutive naturals, for example, 4203547 + ... + 4203564.

Almost surely, 2^75663999 is an apocalyptic number.

75663999 is a deficient number, since it is larger than the sum of its proper divisors (33628457).

75663999 is a wasteful number, since it uses less digits than its factorization.

75663999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8407117 (or 8407114 counting only the distinct ones).

The product of its digits is 2755620, while the sum is 54.

The square root of 75663999 is about 8698.5055613019. The cubic root of 75663999 is about 422.9572077497.

The spelling of 75663999 in words is "seventy-five million, six hundred sixty-three thousand, nine hundred ninety-nine".