71510640 has 80 divisors (see below), whose sum is σ = 227702688. Its totient is φ = 18551808.

The previous prime is 71510629. The next prime is 71510671. The reversal of 71510640 is 4601517.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×71510640² = 10227543266419200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 71510640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4854 + ... + 12906.

Almost surely, 2^71510640 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 71510640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113851344).

71510640 is an abundant number, since it is smaller than the sum of its proper divisors (156192048).

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

71510640 is a wasteful number, since it uses less digits than its factorization.

71510640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8106 (or 8100 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 71510640 is about 8456.3963956286. The cubic root of 71510640 is about 415.0721121119.

The spelling of 71510640 in words is "seventy-one million, five hundred ten thousand, six hundred forty".