71129996 has 72 divisors (see below), whose sum is σ = 155667456. Its totient is φ = 27825120.

The previous prime is 71129917. The next prime is 71130013. The reversal of 71129996 is 69992117.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 313235 + ... + 313461.

It is an arithmetic number, because the mean of its divisors is an integer number (2162048).

Almost surely, 2^71129996 is an apocalyptic number.

71129996 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71129996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77833728).

71129996 is an abundant number, since it is smaller than the sum of its proper divisors (84537460).

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

71129996 is a wasteful number, since it uses less digits than its factorization.

71129996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 286 counting only the distinct ones).

The product of its digits is 61236, while the sum is 44.

The square root of 71129996 is about 8433.8600889510. The cubic root of 71129996 is about 414.3343390523.

The spelling of 71129996 in words is "seventy-one million, one hundred twenty-nine thousand, nine hundred ninety-six".