72688673 has 4 divisors (see below), whose sum is σ = 72897300. Its totient is φ = 72480048.

The previous prime is 72688669. The next prime is 72688687. The reversal of 72688673 is 37688627.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19864849 + 52823824 = 4457^2 + 7268^2 .

It is a cyclic number.

It is not a de Polignac number, because 72688673 - 2² = 72688669 is a prime.

It is a Duffinian number.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 103790 + ... + 104487.

It is an arithmetic number, because the mean of its divisors is an integer number (18224325).

Almost surely, 2^72688673 is an apocalyptic number.

It is an amenable number.

72688673 is a deficient number, since it is larger than the sum of its proper divisors (208627).

72688673 is a wasteful number, since it uses less digits than its factorization.

72688673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208626.

The product of its digits is 677376, while the sum is 47.

The square root of 72688673 is about 8525.7652442464. The cubic root of 72688673 is about 417.3389446559.

The spelling of 72688673 in words is "seventy-two million, six hundred eighty-eight thousand, six hundred seventy-three".