71531070 has 64 divisors (see below), whose sum is σ = 195773760. Its totient is φ = 16570368.

The previous prime is 71531051. The next prime is 71531071. The reversal of 71531070 is 7013517.

It is a self number, because there is not a number n which added to its sum of digits gives 71531070.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71531071) 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, 1236 + ... + 12024.

It is an arithmetic number, because the mean of its divisors is an integer number (3058965).

Almost surely, 2^71531070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71531070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97886880).

71531070 is an abundant number, since it is smaller than the sum of its proper divisors (124242690).

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

71531070 is a wasteful number, since it uses less digits than its factorization.

71531070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10829.

The product of its (nonzero) digits is 735, while the sum is 24.

The square root of 71531070 is about 8457.6042707140. The cubic root of 71531070 is about 415.1116359079. Note that the first 3 decimals are identical.

Adding to 71531070 its reverse (7013517), we get a palindrome (78544587).

The spelling of 71531070 in words is "seventy-one million, five hundred thirty-one thousand, seventy".