71513720 has 64 divisors (see below), whose sum is σ = 171828000. Its totient is φ = 26707968.

The previous prime is 71513707. The next prime is 71513731. The reversal of 71513720 is 2731517.

It is a super-2 number, since 2×71513720² = 10228424296476800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71513720.

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, 54836 + ... + 56124.

Almost surely, 2^71513720 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 71513720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85914000).

71513720 is an abundant number, since it is smaller than the sum of its proper divisors (100314280).

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

71513720 is a wasteful number, since it uses less digits than its factorization.

71513720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392 (or 1388 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 71513720 is about 8456.5785043361. The cubic root of 71513720 is about 415.0780711494.

The spelling of 71513720 in words is "seventy-one million, five hundred thirteen thousand, seven hundred twenty".