71711730 has 72 divisors (see below), whose sum is σ = 193788972. Its totient is φ = 19105632.

The previous prime is 71711701. The next prime is 71711737. The reversal of 71711730 is 3711717.

It can be written as a sum of positive squares in 2 ways, for example, as 66928761 + 4782969 = 8181^2 + 2187^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 71711694 and 71711703.

It is not an unprimeable number, because it can be changed into a prime (71711737) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 65064 + ... + 66156.

Almost surely, 2^71711730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71711730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96894486).

71711730 is an abundant number, since it is smaller than the sum of its proper divisors (122077242).

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

71711730 is an equidigital number, since it uses as much as digits as its factorization.

71711730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124 (or 1103 counting only the distinct ones).

The product of its (nonzero) digits is 1029, while the sum is 27.

The square root of 71711730 is about 8468.2778650680. The cubic root of 71711730 is about 415.4608129447.

The spelling of 71711730 in words is "seventy-one million, seven hundred eleven thousand, seven hundred thirty".