72391704 has 128 divisors (see below), whose sum is σ = 231137280. Its totient is φ = 18345600.

The previous prime is 72391699. The next prime is 72391771. The reversal of 72391704 is 40719327.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79009 + ... + 79919.

It is an arithmetic number, because the mean of its divisors is an integer number (1805760).

Almost surely, 2^72391704 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 72391704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115568640).

72391704 is an abundant number, since it is smaller than the sum of its proper divisors (158745576).

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

72391704 is a wasteful number, since it uses less digits than its factorization.

72391704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981 (or 977 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 72391704 is about 8508.3314462943. The cubic root of 72391704 is about 416.7698239163.

The spelling of 72391704 in words is "seventy-two million, three hundred ninety-one thousand, seven hundred four".