72684409 has 8 divisors (see below), whose sum is σ = 83119680. Its totient is φ = 62262096.

The previous prime is 72684407. The next prime is 72684413. The reversal of 72684409 is 90448627.

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 72684409 - 2¹ = 72684407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72684407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18807 + ... + 22339.

It is an arithmetic number, because the mean of its divisors is an integer number (10389960).

Almost surely, 2^72684409 is an apocalyptic number.

It is an amenable number.

72684409 is a deficient number, since it is larger than the sum of its proper divisors (10435271).

72684409 is a wasteful number, since it uses less digits than its factorization.

72684409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6479.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 72684409 is about 8525.5151750495. The cubic root of 72684409 is about 417.3307839711.

The spelling of 72684409 in words is "seventy-two million, six hundred eighty-four thousand, four hundred nine".