72009842 has 8 divisors (see below), whose sum is σ = 111739500. Its totient is φ = 34763344.

The previous prime is 72009827. The next prime is 72009851. The reversal of 72009842 is 24890027.

It can be written as a sum of positive squares in 2 ways, for example, as 68873401 + 3136441 = 8299^2 + 1771^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 72009799 and 72009808.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620717 + ... + 620832.

Almost surely, 2^72009842 is an apocalyptic number.

72009842 is a deficient number, since it is larger than the sum of its proper divisors (39729658).

72009842 is a wasteful number, since it uses less digits than its factorization.

72009842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241580.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 72009842 is about 8485.8612998328. The cubic root of 72009842 is about 416.0357194736.

Adding to 72009842 its reverse (24890027), we get a palindrome (96899869).

The spelling of 72009842 in words is "seventy-two million, nine thousand, eight hundred forty-two".