72811320 has 64 divisors (see below), whose sum is σ = 219248640. Its totient is φ = 19344000.

The previous prime is 72811309. The next prime is 72811327. The reversal of 72811320 is 2311827.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72811327) 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 15 ways as a sum of consecutive naturals, for example, 36345 + ... + 38295.

It is an arithmetic number, because the mean of its divisors is an integer number (3425760).

Almost surely, 2^72811320 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 72811320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109624320).

72811320 is an abundant number, since it is smaller than the sum of its proper divisors (146437320).

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

72811320 is a wasteful number, since it uses less digits than its factorization.

72811320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2276 (or 2272 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 72811320 is about 8532.9549395271. The cubic root of 72811320 is about 417.5735369529.

The spelling of 72811320 in words is "seventy-two million, eight hundred eleven thousand, three hundred twenty".