73717997 has 4 divisors (see below), whose sum is σ = 73750236. Its totient is φ = 73685760.

The previous prime is 73717993. The next prime is 73718009. The reversal of 73717997 is 79971737.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79971737 = 751 ⋅106487.

It can be written as a sum of positive squares in 2 ways, for example, as 23222761 + 50495236 = 4819^2 + 7106^2 .

It is a cyclic number.

It is not a de Polignac number, because 73717997 - 2² = 73717993 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 (73717993) 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, 12404 + ... + 17357.

It is an arithmetic number, because the mean of its divisors is an integer number (18437559).

Almost surely, 2^73717997 is an apocalyptic number.

It is an amenable number.

73717997 is a deficient number, since it is larger than the sum of its proper divisors (32239).

73717997 is a wasteful number, since it uses less digits than its factorization.

73717997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32238.

The product of its digits is 583443, while the sum is 50.

The square root of 73717997 is about 8585.9185297789. The cubic root of 73717997 is about 419.2996586190.

The spelling of 73717997 in words is "seventy-three million, seven hundred seventeen thousand, nine hundred ninety-seven".