71218656 has 96 divisors (see below), whose sum is σ = 214502400. Its totient is φ = 22965120.

The previous prime is 71218597. The next prime is 71218657. The reversal of 71218656 is 65681217.

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 (36).

It is a self number, because there is not a number n which added to its sum of digits gives 71218656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71218657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25455 + ... + 28113.

It is an arithmetic number, because the mean of its divisors is an integer number (2234400).

Almost surely, 2^71218656 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 71218656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107251200).

71218656 is an abundant number, since it is smaller than the sum of its proper divisors (143283744).

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

71218656 is a wasteful number, since it uses less digits than its factorization.

71218656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2709 (or 2695 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 71218656 is about 8439.1146455064. The cubic root of 71218656 is about 414.5064166211.

The spelling of 71218656 in words is "seventy-one million, two hundred eighteen thousand, six hundred fifty-six".