72111870 has 80 divisors (see below), whose sum is σ = 195706368. Its totient is φ = 19051200.

The previous prime is 72111847. The next prime is 72111883. The reversal of 72111870 is 7811127.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 102520 + ... + 103220.

Almost surely, 2^72111870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72111870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97853184).

72111870 is an abundant number, since it is smaller than the sum of its proper divisors (123594498).

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

72111870 is a wasteful number, since it uses less digits than its factorization.

72111870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847 (or 838 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 27.

The square root of 72111870 is about 8491.8708186124. The cubic root of 72111870 is about 416.2321151312.

Adding to 72111870 its reverse (7811127), we get a palindrome (79922997).

The spelling of 72111870 in words is "seventy-two million, one hundred eleven thousand, eight hundred seventy".