73215761 has 6 divisors (see below), whose sum is σ = 74120130. Its totient is φ = 72313296.

The previous prime is 73215743. The next prime is 73215763. The reversal of 73215761 is 16751237.

It can be written as a sum of positive squares in only one way, i.e., 52649536 + 20566225 = 7256^2 + 4535^2 .

It is not a de Polignac number, because 73215761 - 2¹⁰ = 73214737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73215763) 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, 80270 + ... + 81176.

It is an arithmetic number, because the mean of its divisors is an integer number (12353355).

Almost surely, 2^73215761 is an apocalyptic number.

It is an amenable number.

73215761 is a deficient number, since it is larger than the sum of its proper divisors (904369).

73215761 is an frugal number, since it uses more digits than its factorization.

73215761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1903 (or 996 counting only the distinct ones).

The product of its digits is 8820, while the sum is 32.

The square root of 73215761 is about 8556.6208867753. The cubic root of 73215761 is about 418.3452673361.

Adding to 73215761 its reverse (16751237), we get a palindrome (89966998).

The spelling of 73215761 in words is "seventy-three million, two hundred fifteen thousand, seven hundred sixty-one".