71381530 has 64 divisors (see below), whose sum is σ = 146727936. Its totient is φ = 24974400.

The previous prime is 71381509. The next prime is 71381617. The reversal of 71381530 is 3518317.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 412524 + ... + 412696.

It is an arithmetic number, because the mean of its divisors is an integer number (2292624).

Almost surely, 2^71381530 is an apocalyptic number.

71381530 is an abundant number, since it is smaller than the sum of its proper divisors (75346406).

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

71381530 is a wasteful number, since it uses less digits than its factorization.

71381530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 71381530 is about 8448.7590804804. The cubic root of 71381530 is about 414.8221621539.

Adding to 71381530 its reverse (3518317), we get a palindrome (74899847).

It can be divided in two parts, 7138 and 1530, that added together give a palindrome (8668).

The spelling of 71381530 in words is "seventy-one million, three hundred eighty-one thousand, five hundred thirty".