72012309 has 8 divisors (see below), whose sum is σ = 96094080. Its totient is φ = 47969376.

The previous prime is 72012271. The next prime is 72012331. The reversal of 72012309 is 90321027.

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

It is not a de Polignac number, because 72012309 - 2⁷ = 72012181 is a prime.

It is a super-2 number, since 2×72012309² = 10371545295022962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72014309) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5064 + ... + 13025.

It is an arithmetic number, because the mean of its divisors is an integer number (12011760).

Almost surely, 2^72012309 is an apocalyptic number.

It is an amenable number.

72012309 is a deficient number, since it is larger than the sum of its proper divisors (24081771).

72012309 is a wasteful number, since it uses less digits than its factorization.

72012309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19419.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 72012309 is about 8486.0066580224. The cubic root of 72012309 is about 416.0404704371.

The spelling of 72012309 in words is "seventy-two million, twelve thousand, three hundred nine".