72786461647 has 4 divisors (see below), whose sum is σ = 73112858560. Its totient is φ = 72460064736.

The previous prime is 72786461609. The next prime is 72786461659. The reversal of 72786461647 is 74616468727.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72786461647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72786461591 and 72786461600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72786461677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163198122 + ... + 163198567.

It is an arithmetic number, because the mean of its divisors is an integer number (18278214640).

Almost surely, 2^72786461647 is an apocalyptic number.

72786461647 is a deficient number, since it is larger than the sum of its proper divisors (326396913).

72786461647 is a wasteful number, since it uses less digits than its factorization.

72786461647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326396912.

The product of its digits is 18966528, while the sum is 58.

The spelling of 72786461647 in words is "seventy-two billion, seven hundred eighty-six million, four hundred sixty-one thousand, six hundred forty-seven".