73145917 has 32 divisors (see below), whose sum is σ = 87907680. Its totient is φ = 60211200.

The previous prime is 73145887. The next prime is 73145921. The reversal of 73145917 is 71954137.

It can be written as a sum of positive squares in 16 ways, for example, as 14485636 + 58660281 = 3806^2 + 7659^2 .

It is a cyclic number.

It is not a de Polignac number, because 73145917 - 2⁷ = 73145789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73145987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 647253 + ... + 647365.

It is an arithmetic number, because the mean of its divisors is an integer number (2747115).

Almost surely, 2^73145917 is an apocalyptic number.

It is an amenable number.

73145917 is a deficient number, since it is larger than the sum of its proper divisors (14761763).

73145917 is a wasteful number, since it uses less digits than its factorization.

73145917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273.

The product of its digits is 26460, while the sum is 37.

The square root of 73145917 is about 8552.5386289686. The cubic root of 73145917 is about 418.2121985247.

It can be divided in two parts, 7314 and 5917, that added together give a palindrome (13231).

The spelling of 73145917 in words is "seventy-three million, one hundred forty-five thousand, nine hundred seventeen".