73865645 has 16 divisors (see below), whose sum is σ = 101443968. Its totient is φ = 50579520.

The previous prime is 73865633. The next prime is 73865647. The reversal of 73865645 is 54656837.

It is not a de Polignac number, because 73865645 - 2¹⁶ = 73800109 is a prime.

It is a super-3 number, since 3×73865645³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73865596 and 73865605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73865647) 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, 40442 + ... + 42228.

It is an arithmetic number, because the mean of its divisors is an integer number (6340248).

Almost surely, 2^73865645 is an apocalyptic number.

It is an amenable number.

73865645 is a deficient number, since it is larger than the sum of its proper divisors (27578323).

73865645 is a wasteful number, since it uses less digits than its factorization.

73865645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2980.

The product of its digits is 604800, while the sum is 44.

The square root of 73865645 is about 8594.5124934460. The cubic root of 73865645 is about 419.5794069961.

It can be divided in two parts, 7386 and 5645, that added together give a palindrome (13031).

The spelling of 73865645 in words is "seventy-three million, eight hundred sixty-five thousand, six hundred forty-five".