73920305 has 16 divisors (see below), whose sum is σ = 90239184. Its totient is φ = 58122240.

The previous prime is 73920299. The next prime is 73920307. The reversal of 73920305 is 50302937.

It can be written as a sum of positive squares in 8 ways, for example, as 80656 + 73839649 = 284^2 + 8593^2 .

It is a de Polignac number, because none of the positive numbers 2^k-73920305 is a prime.

It is a super-2 number, since 2×73920305² = 10928422982586050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73920307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83465 + ... + 84345.

It is an arithmetic number, because the mean of its divisors is an integer number (5639949).

Almost surely, 2^73920305 is an apocalyptic number.

It is an amenable number.

73920305 is a deficient number, since it is larger than the sum of its proper divisors (16318879).

73920305 is a wasteful number, since it uses less digits than its factorization.

73920305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156.

The product of its (nonzero) digits is 5670, while the sum is 29.

The square root of 73920305 is about 8597.6918414188. The cubic root of 73920305 is about 419.6828766387.

The spelling of 73920305 in words is "seventy-three million, nine hundred twenty thousand, three hundred five".