71381465520 has 120 divisors (see below), whose sum is σ = 228651691248. Its totient is φ = 18420963840.

The previous prime is 71381465453. The next prime is 71381465521. The reversal of 71381465520 is 2556418317.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (71381465521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75894 + ... + 385386.

Almost surely, 2^71381465520 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 71381465520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114325845624).

71381465520 is an abundant number, since it is smaller than the sum of its proper divisors (157270225728).

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

71381465520 is a wasteful number, since it uses less digits than its factorization.

71381465520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309571 (or 309534 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 42.

The spelling of 71381465520 in words is "seventy-one billion, three hundred eighty-one million, four hundred sixty-five thousand, five hundred twenty".