73726643 has 4 divisors (see below), whose sum is σ = 73743960. Its totient is φ = 73709328.

The previous prime is 73726591. The next prime is 73726663. The reversal of 73726643 is 34662737.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73726643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73726597 and 73726606.

It is not an unprimeable number, because it can be changed into a prime (73726663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2663 + ... + 12431.

It is an arithmetic number, because the mean of its divisors is an integer number (18435990).

Almost surely, 2^73726643 is an apocalyptic number.

73726643 is a deficient number, since it is larger than the sum of its proper divisors (17317).

73726643 is an equidigital number, since it uses as much as digits as its factorization.

73726643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17316.

The product of its digits is 127008, while the sum is 38.

The square root of 73726643 is about 8586.4220138542. The cubic root of 73726643 is about 419.3160504693.

The spelling of 73726643 in words is "seventy-three million, seven hundred twenty-six thousand, six hundred forty-three".