71505144940 has 24 divisors (see below), whose sum is σ = 150168658752. Its totient is φ = 28600561920.

The previous prime is 71505144911. The next prime is 71505144941. The reversal of 71505144940 is 4944150517.

It is a happy number.

It is a super-2 number, since 2×71505144940² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71505144893 and 71505144902.

It is not an unprimeable number, because it can be changed into a prime (71505144941) 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, 349645 + ... + 515035.

It is an arithmetic number, because the mean of its divisors is an integer number (6257027448).

Almost surely, 2^71505144940 is an apocalyptic number.

It is an amenable number.

71505144940 is an abundant number, since it is smaller than the sum of its proper divisors (78663513812).

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

71505144940 is a wasteful number, since it uses less digits than its factorization.

71505144940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187017 (or 187015 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 71505144940 in words is "seventy-one billion, five hundred five million, one hundred forty-four thousand, nine hundred forty".