71506391320 has 128 divisors (see below), whose sum is σ = 208439884800. Its totient is φ = 21439489536.

The previous prime is 71506391293. The next prime is 71506391329. The reversal of 71506391320 is 2319360517.

It is a super-2 number, since 2×71506391320² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71506391320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71506391329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 447804 + ... + 586123.

It is an arithmetic number, because the mean of its divisors is an integer number (1628436600).

Almost surely, 2^71506391320 is an apocalyptic number.

71506391320 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

71506391320 is an abundant number, since it is smaller than the sum of its proper divisors (136933493480).

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

71506391320 is a wasteful number, since it uses less digits than its factorization.

71506391320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033977 (or 1033973 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 37.

The spelling of 71506391320 in words is "seventy-one billion, five hundred six million, three hundred ninety-one thousand, three hundred twenty".