72733989787 has 4 divisors (see below), whose sum is σ = 73306698496. Its totient is φ = 72161281080.

The previous prime is 72733989773. The next prime is 72733989817. The reversal of 72733989787 is 78798933727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78798933727 = 71 ⋅1109844137.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72733989787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72733989287) 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, 286354164 + ... + 286354417.

It is an arithmetic number, because the mean of its divisors is an integer number (18326674624).

Almost surely, 2^72733989787 is an apocalyptic number.

72733989787 is a deficient number, since it is larger than the sum of its proper divisors (572708709).

72733989787 is a wasteful number, since it uses less digits than its factorization.

72733989787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572708708.

The product of its digits is 224042112, while the sum is 70.

The spelling of 72733989787 in words is "seventy-two billion, seven hundred thirty-three million, nine hundred eighty-nine thousand, seven hundred eighty-seven".