71319940 has 24 divisors (see below), whose sum is σ = 150131520. Its totient is φ = 28459488.

The previous prime is 71319931. The next prime is 71319943. The reversal of 71319940 is 4991317.

It is a junction number, because it is equal to n+sod(n) for n = 71319896 and 71319905.

It is not an unprimeable number, because it can be changed into a prime (71319943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4719 + ... + 12841.

It is an arithmetic number, because the mean of its divisors is an integer number (6255480).

Almost surely, 2^71319940 is an apocalyptic number.

It is an amenable number.

71319940 is an abundant number, since it is smaller than the sum of its proper divisors (78811580).

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

71319940 is a wasteful number, since it uses less digits than its factorization.

71319940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8571 (or 8569 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 71319940 is about 8445.1133799375. The cubic root of 71319940 is about 414.7028210648.

It can be divided in two parts, 7131 and 9940, that added together give a palindrome (17071).

The spelling of 71319940 in words is "seventy-one million, three hundred nineteen thousand, nine hundred forty".