73643645 has 8 divisors (see below), whose sum is σ = 89247960. Its totient is φ = 58331200.

The previous prime is 73643629. The next prime is 73643657. The reversal of 73643645 is 54634637.

It can be written as a sum of positive squares in 4 ways, for example, as 10329796 + 63313849 = 3214^2 + 7957^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 73643645 - 2⁴ = 73643629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 73643599 and 73643608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72410 + ... + 73419.

It is an arithmetic number, because the mean of its divisors is an integer number (11155995).

Almost surely, 2^73643645 is an apocalyptic number.

It is an amenable number.

73643645 is a deficient number, since it is larger than the sum of its proper divisors (15604315).

73643645 is a wasteful number, since it uses less digits than its factorization.

73643645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145935.

The product of its digits is 181440, while the sum is 38.

The square root of 73643645 is about 8581.5875570899. The cubic root of 73643645 is about 419.1586426000.

The spelling of 73643645 in words is "seventy-three million, six hundred forty-three thousand, six hundred forty-five".