72659647 has 4 divisors (see below), whose sum is σ = 73040256. Its totient is φ = 72279040.

The previous prime is 72659633. The next prime is 72659663. The reversal of 72659647 is 74695627.

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-72659647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72659597 and 72659606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72659627) 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, 190018 + ... + 190399.

It is an arithmetic number, because the mean of its divisors is an integer number (18260064).

Almost surely, 2^72659647 is an apocalyptic number.

72659647 is a deficient number, since it is larger than the sum of its proper divisors (380609).

72659647 is a wasteful number, since it uses less digits than its factorization.

72659647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380608.

The product of its digits is 635040, while the sum is 46.

The square root of 72659647 is about 8524.0628223870. The cubic root of 72659647 is about 417.2833867426.

The spelling of 72659647 in words is "seventy-two million, six hundred fifty-nine thousand, six hundred forty-seven".