72656609 has 8 divisors (see below), whose sum is σ = 76948800. Its totient is φ = 68458896.

The previous prime is 72656603. The next prime is 72656611. The reversal of 72656609 is 90665627.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72656609 - 2⁴ = 72656593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72656603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22034 + ... + 25115.

It is an arithmetic number, because the mean of its divisors is an integer number (9618600).

Almost surely, 2^72656609 is an apocalyptic number.

It is an amenable number.

72656609 is a deficient number, since it is larger than the sum of its proper divisors (4292191).

72656609 is a wasteful number, since it uses less digits than its factorization.

72656609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47239.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 72656609 is about 8523.8846191159. The cubic root of 72656609 is about 417.2775709304.

The spelling of 72656609 in words is "seventy-two million, six hundred fifty-six thousand, six hundred nine".