71660736 has 126 divisors (see below), whose sum is σ = 239031780. Its totient is φ = 20466432.

The previous prime is 71660713. The next prime is 71660737. The reversal of 71660736 is 63706617.

71660736 is a `hidden beast` number, since 7 + 16 + 607 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (126).

It is a super-2 number, since 2×71660736² = 10270522168123392, which contains 22 as substring.

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 71660736.

It is not an unprimeable number, because it can be changed into a prime (71660737) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 26955 + ... + 29493.

Almost surely, 2^71660736 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 71660736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119515890).

71660736 is an abundant number, since it is smaller than the sum of its proper divisors (167371044).

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

71660736 is a wasteful number, since it uses less digits than its factorization.

71660736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571 (or 2551 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 36.

The square root of 71660736 is about 8465.2664458953. The cubic root of 71660736 is about 415.3623119395.

The spelling of 71660736 in words is "seventy-one million, six hundred sixty thousand, seven hundred thirty-six".