72756823445 has 4 divisors (see below), whose sum is σ = 87308188140. Its totient is φ = 58205458752.

The previous prime is 72756823423. The next prime is 72756823459. The reversal of 72756823445 is 54432865727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54432865727 = 2897 ⋅18789391.

It can be written as a sum of positive squares in 2 ways, for example, as 24886009009 + 47870814436 = 157753^2 + 218794^2 .

It is a cyclic number.

It is not a de Polignac number, because 72756823445 - 2⁸ = 72756823189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7275682340 + ... + 7275682349.

It is an arithmetic number, because the mean of its divisors is an integer number (21827047035).

Almost surely, 2^72756823445 is an apocalyptic number.

It is an amenable number.

72756823445 is a deficient number, since it is larger than the sum of its proper divisors (14551364695).

72756823445 is a wasteful number, since it uses less digits than its factorization.

72756823445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14551364694.

The product of its digits is 11289600, while the sum is 53.

The spelling of 72756823445 in words is "seventy-two billion, seven hundred fifty-six million, eight hundred twenty-three thousand, four hundred forty-five".