72391326 has 48 divisors (see below), whose sum is σ = 170778384. Its totient is φ = 20393856.

The previous prime is 72391313. The next prime is 72391367. The reversal of 72391326 is 62319327.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19776 + ... + 23148.

It is an arithmetic number, because the mean of its divisors is an integer number (3557883).

Almost surely, 2^72391326 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72391326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85389192).

72391326 is an abundant number, since it is smaller than the sum of its proper divisors (98387058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72391326 is a wasteful number, since it uses less digits than its factorization.

72391326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3465 (or 3458 counting only the distinct ones).

The product of its digits is 13608, while the sum is 33.

The square root of 72391326 is about 8508.3092327442. The cubic root of 72391326 is about 416.7690985142.

The spelling of 72391326 in words is "seventy-two million, three hundred ninety-one thousand, three hundred twenty-six".