73644543 has 48 divisors (see below), whose sum is σ = 127033920. Its totient is φ = 40223232.

The previous prime is 73644533. The next prime is 73644547. The reversal of 73644543 is 34544637.

It is a happy number.

73644543 is a `hidden beast` number, since 7 + 3 + 644 + 5 + 4 + 3 = 666.

It is not a de Polignac number, because 73644543 - 2⁹ = 73644031 is a prime.

Its product of digits (120960) is a multiple of the sum of its prime factors (448).

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 73644498 and 73644507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73644547) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 315955 + ... + 316187.

It is an arithmetic number, because the mean of its divisors is an integer number (2646540).

Almost surely, 2^73644543 is an apocalyptic number.

73644543 is a deficient number, since it is larger than the sum of its proper divisors (53389377).

73644543 is a wasteful number, since it uses less digits than its factorization.

73644543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448 (or 445 counting only the distinct ones).

The product of its digits is 120960, while the sum is 36.

The square root of 73644543 is about 8581.6398782517. The cubic root of 73644543 is about 419.1603463131.

The spelling of 73644543 in words is "seventy-three million, six hundred forty-four thousand, five hundred forty-three".