72231776 has 72 divisors (see below), whose sum is σ = 158029704. Its totient is φ = 32384000.

The previous prime is 72231713. The next prime is 72231781. The reversal of 72231776 is 67713227.

It is a super-2 number, since 2×72231776² = 10434858928228352, which contains 22 as substring.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 287651 + ... + 287901.

It is an arithmetic number, because the mean of its divisors is an integer number (2194857).

Almost surely, 2^72231776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72231776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79014852).

72231776 is an abundant number, since it is smaller than the sum of its proper divisors (85797928).

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

72231776 is a wasteful number, since it uses less digits than its factorization.

72231776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 293 counting only the distinct ones).

The product of its digits is 24696, while the sum is 35.

The square root of 72231776 is about 8498.9279323924. The cubic root of 72231776 is about 416.4626878564.

The spelling of 72231776 in words is "seventy-two million, two hundred thirty-one thousand, seven hundred seventy-six".