75663997 has 4 divisors (see below), whose sum is σ = 78953760. Its totient is φ = 72374236.

The previous prime is 75663953. The next prime is 75664007. The reversal of 75663997 is 79936657.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75663997 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 (75663397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1644847 + ... + 1644892.

It is an arithmetic number, because the mean of its divisors is an integer number (19738440).

Almost surely, 2^75663997 is an apocalyptic number.

It is an amenable number.

75663997 is a deficient number, since it is larger than the sum of its proper divisors (3289763).

75663997 is a wasteful number, since it uses less digits than its factorization.

75663997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3289762.

The product of its digits is 2143260, while the sum is 52.

The square root of 75663997 is about 8698.5054463396. The cubic root of 75663997 is about 422.9572040230.

The spelling of 75663997 in words is "seventy-five million, six hundred sixty-three thousand, nine hundred ninety-seven".