73721297 has 4 divisors (see below), whose sum is σ = 79392180. Its totient is φ = 68050416.

The previous prime is 73721293. The next prime is 73721327. The reversal of 73721297 is 79212737.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79212737 = 1229 ⋅64453.

It can be written as a sum of positive squares in 2 ways, for example, as 23580736 + 50140561 = 4856^2 + 7081^2 .

It is a cyclic number.

It is not a de Polignac number, because 73721297 - 2² = 73721293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 73721297.

It is not an unprimeable number, because it can be changed into a prime (73721293) 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 3 ways as a sum of consecutive naturals, for example, 2835422 + ... + 2835447.

It is an arithmetic number, because the mean of its divisors is an integer number (19848045).

Almost surely, 2^73721297 is an apocalyptic number.

It is an amenable number.

73721297 is a deficient number, since it is larger than the sum of its proper divisors (5670883).

73721297 is a wasteful number, since it uses less digits than its factorization.

73721297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5670882.

The product of its digits is 37044, while the sum is 38.

The square root of 73721297 is about 8586.1107027571. The cubic root of 73721297 is about 419.3059152016.

The spelling of 73721297 in words is "seventy-three million, seven hundred twenty-one thousand, two hundred ninety-seven".