71983912 has 128 divisors (see below), whose sum is σ = 185068800. Its totient is φ = 25344000.

The previous prime is 71983903. The next prime is 71983921. The reversal of 71983912 is 21938917.

It is an interprime number because it is at equal distance from previous prime (71983903) and next prime (71983921).

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, 712662 + ... + 712762.

It is an arithmetic number, because the mean of its divisors is an integer number (1445850).

It is a vampire number, since it can be written as 7832 ⋅ 9191 (with its own digits).

Almost surely, 2^71983912 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 71983912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92534400).

71983912 is an abundant number, since it is smaller than the sum of its proper divisors (113084888).

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

71983912 is a wasteful number, since it uses less digits than its factorization.

71983912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 223 counting only the distinct ones).

The product of its digits is 27216, while the sum is 40.

The square root of 71983912 is about 8484.3333267853. Note that the first 4 decimals coincide. The cubic root of 71983912 is about 415.9857767573.

The spelling of 71983912 in words is "seventy-one million, nine hundred eighty-three thousand, nine hundred twelve".