72109732 has 12 divisors (see below), whose sum is σ = 126299376. Its totient is φ = 36024200.

The previous prime is 72109727. The next prime is 72109759. The reversal of 72109732 is 23790127.

It is a super-2 number, since 2×72109732² = 10399626898223648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72109694 and 72109703.

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, 1894 + ... + 12157.

It is an arithmetic number, because the mean of its divisors is an integer number (10524948).

Almost surely, 2^72109732 is an apocalyptic number.

It is an amenable number.

72109732 is a deficient number, since it is larger than the sum of its proper divisors (54189644).

72109732 is a wasteful number, since it uses less digits than its factorization.

72109732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15338 (or 15336 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 72109732 is about 8491.7449325801. The cubic root of 72109732 is about 416.2280015549.

Adding to 72109732 its reverse (23790127), we get a palindrome (95899859).

The spelling of 72109732 in words is "seventy-two million, one hundred nine thousand, seven hundred thirty-two".