73213645 has 16 divisors (see below), whose sum is σ = 94210560. Its totient is φ = 54422784.

The previous prime is 73213643. The next prime is 73213681. The reversal of 73213645 is 54631237.

It is not a de Polignac number, because 73213645 - 2¹ = 73213643 is a prime.

It is a super-3 number, since 3×73213645³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73213643) 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, 1264 + ... + 12166.

It is an arithmetic number, because the mean of its divisors is an integer number (5888160).

Almost surely, 2^73213645 is an apocalyptic number.

It is an amenable number.

73213645 is a deficient number, since it is larger than the sum of its proper divisors (20996915).

73213645 is a wasteful number, since it uses less digits than its factorization.

73213645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11004.

The product of its digits is 15120, while the sum is 31.

The square root of 73213645 is about 8556.4972389407. The cubic root of 73213645 is about 418.3412371150.

The spelling of 73213645 in words is "seventy-three million, two hundred thirteen thousand, six hundred forty-five".