72688646 has 16 divisors (see below), whose sum is σ = 112265376. Its totient is φ = 35271936.

The previous prime is 72688643. The next prime is 72688669. The reversal of 72688646 is 64688627.

It is a self number, because there is not a number n which added to its sum of digits gives 72688646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72688643) 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, 35030 + ... + 37046.

It is an arithmetic number, because the mean of its divisors is an integer number (7016586).

Almost surely, 2^72688646 is an apocalyptic number.

72688646 is a deficient number, since it is larger than the sum of its proper divisors (39576730).

72688646 is a wasteful number, since it uses less digits than its factorization.

72688646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2543.

The product of its digits is 774144, while the sum is 47.

The square root of 72688646 is about 8525.7636608107. The cubic root of 72688646 is about 417.3388929828.

The spelling of 72688646 in words is "seventy-two million, six hundred eighty-eight thousand, six hundred forty-six".