72212909 has 8 divisors (see below), whose sum is σ = 73716480. Its totient is φ = 70724896.

The previous prime is 72212891. The next prime is 72212941. The reversal of 72212909 is 90921227.

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 72212909 - 2¹² = 72208813 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72212009) 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, 5732 + ... + 13314.

It is an arithmetic number, because the mean of its divisors is an integer number (9214560).

Almost surely, 2^72212909 is an apocalyptic number.

It is an amenable number.

72212909 is a deficient number, since it is larger than the sum of its proper divisors (1503571).

72212909 is a wasteful number, since it uses less digits than its factorization.

72212909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7779.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 72212909 is about 8497.8178963779. The cubic root of 72212909 is about 416.4264245654.

It can be divided in two parts, 722 and 12909, that added together give a palindrome (13631).

The spelling of 72212909 in words is "seventy-two million, two hundred twelve thousand, nine hundred nine".