71297720 has 96 divisors (see below), whose sum is σ = 177876000. Its totient is φ = 25698816.

The previous prime is 71297719. The next prime is 71297761. The reversal of 71297720 is 2779217.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 358181 + ... + 358379.

It is an arithmetic number, because the mean of its divisors is an integer number (1852875).

Almost surely, 2^71297720 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 71297720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88938000).

71297720 is an abundant number, since it is smaller than the sum of its proper divisors (106578280).

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

71297720 is a wasteful number, since it uses less digits than its factorization.

71297720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 35.

The square root of 71297720 is about 8443.7977237733. The cubic root of 71297720 is about 414.6597491749.

The spelling of 71297720 in words is "seventy-one million, two hundred ninety-seven thousand, seven hundred twenty".