73431645 has 24 divisors (see below), whose sum is σ = 136674144. Its totient is φ = 33568416.

The previous prime is 73431641. The next prime is 73431661. The reversal of 73431645 is 54613437.

It is not a de Polignac number, because 73431645 - 2² = 73431641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73431641) 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 23 ways as a sum of consecutive naturals, for example, 49219 + ... + 50688.

It is an arithmetic number, because the mean of its divisors is an integer number (5694756).

Almost surely, 2^73431645 is an apocalyptic number.

It is an amenable number.

73431645 is a deficient number, since it is larger than the sum of its proper divisors (63242499).

73431645 is a wasteful number, since it uses less digits than its factorization.

73431645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99929 (or 99922 counting only the distinct ones).

The product of its digits is 30240, while the sum is 33.

The square root of 73431645 is about 8569.2266278819. The cubic root of 73431645 is about 418.7560414960.

The spelling of 73431645 in words is "seventy-three million, four hundred thirty-one thousand, six hundred forty-five".