73720311836 has 6 divisors (see below), whose sum is σ = 129010545720. Its totient is φ = 36860155916.

The previous prime is 73720311823. The next prime is 73720311859. The reversal of 73720311836 is 63811302737.

It is a junction number, because it is equal to n+sod(n) for n = 73720311793 and 73720311802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9215038976 + ... + 9215038983.

It is an arithmetic number, because the mean of its divisors is an integer number (21501757620).

Almost surely, 2^73720311836 is an apocalyptic number.

It is an amenable number.

73720311836 is a deficient number, since it is larger than the sum of its proper divisors (55290233884).

73720311836 is a wasteful number, since it uses less digits than its factorization.

73720311836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18430077963 (or 18430077961 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 41.

Subtracting from 73720311836 its reverse (63811302737), we obtain a palindrome (9909009099).

The spelling of 73720311836 in words is "seventy-three billion, seven hundred twenty million, three hundred eleven thousand, eight hundred thirty-six".