72709031 has 8 divisors (see below), whose sum is σ = 74759328. Its totient is φ = 70672000.

The previous prime is 72709027. The next prime is 72709037. The reversal of 72709031 is 13090727.

It is a happy number.

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 72709031 - 2² = 72709027 is a prime.

It is a super-2 number, since 2×72709031² = 10573206377917922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72708985 and 72709003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72709037) 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, 8366 + ... + 14676.

It is an arithmetic number, because the mean of its divisors is an integer number (9344916).

Almost surely, 2^72709031 is an apocalyptic number.

72709031 is a deficient number, since it is larger than the sum of its proper divisors (2050297).

72709031 is a wasteful number, since it uses less digits than its factorization.

72709031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6633.

The product of its (nonzero) digits is 2646, while the sum is 29.

The square root of 72709031 is about 8526.9590710874. The cubic root of 72709031 is about 417.3779025514.

Adding to 72709031 its reverse (13090727), we get a palindrome (85799758).

The spelling of 72709031 in words is "seventy-two million, seven hundred nine thousand, thirty-one".