71015040 has 96 divisors (see below), whose sum is σ = 245243700. Its totient is φ = 18935808.

The previous prime is 71015029. The next prime is 71015047. The reversal of 71015040 is 4051017.

It can be written as a sum of positive squares in 2 ways, for example, as 57881664 + 13133376 = 7608^2 + 3624^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (71015047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 405 + ... + 11924.

Almost surely, 2^71015040 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 71015040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122621850).

71015040 is an abundant number, since it is smaller than the sum of its proper divisors (174228660).

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

71015040 is a wasteful number, since it uses less digits than its factorization.

71015040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12354 (or 12339 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 71015040 is about 8427.0421857257. The cubic root of 71015040 is about 414.1110113282. Note that the first 3 decimals are identical.

Adding to 71015040 its reverse (4051017), we get a palindrome (75066057).

The spelling of 71015040 in words is "seventy-one million, fifteen thousand, forty".