71034640 has 40 divisors (see below), whose sum is σ = 170489088. Its totient is φ = 27496320.

The previous prime is 71034629. The next prime is 71034641. The reversal of 71034640 is 4643017.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (71034641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11842 + ... + 16801.

Almost surely, 2^71034640 is an apocalyptic number.

It is an amenable number.

71034640 is an abundant number, since it is smaller than the sum of its proper divisors (99454448).

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

71034640 is a wasteful number, since it uses less digits than its factorization.

71034640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28687 (or 28681 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 71034640 is about 8428.2050283557. The cubic root of 71034640 is about 414.1491057432.

Adding to 71034640 its reverse (4643017), we get a palindrome (75677657).

The spelling of 71034640 in words is "seventy-one million, thirty-four thousand, six hundred forty".