72756823457 has 4 divisors (see below), whose sum is σ = 72779165316. Its totient is φ = 72734481600.

The previous prime is 72756823423. The next prime is 72756823459. The reversal of 72756823457 is 75432865727.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65278206016 + 7478617441 = 255496^2 + 86479^2 .

It is a cyclic number.

It is not a de Polignac number, because 72756823457 - 2⁸ = 72756823201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72756823459) 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, 11166044 + ... + 11172557.

It is an arithmetic number, because the mean of its divisors is an integer number (18194791329).

Almost surely, 2^72756823457 is an apocalyptic number.

It is an amenable number.

72756823457 is a deficient number, since it is larger than the sum of its proper divisors (22341859).

72756823457 is a wasteful number, since it uses less digits than its factorization.

72756823457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22341858.

The product of its digits is 19756800, while the sum is 56.

The spelling of 72756823457 in words is "seventy-two billion, seven hundred fifty-six million, eight hundred twenty-three thousand, four hundred fifty-seven".