71000730 has 24 divisors (see below), whose sum is σ = 184602132. Its totient is φ = 18933504.

The previous prime is 71000719. The next prime is 71000731. The reversal of 71000730 is 3700017.

It can be written as a sum of positive squares in 2 ways, for example, as 69405561 + 1595169 = 8331^2 + 1263^2 .

It is a super-2 number, since 2×71000730² = 10082207321065800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (71000731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 394359 + ... + 394538.

Almost surely, 2^71000730 is an apocalyptic number.

71000730 is an abundant number, since it is smaller than the sum of its proper divisors (113601402).

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

71000730 is a wasteful number, since it uses less digits than its factorization.

71000730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788910 (or 788907 counting only the distinct ones).

The product of its (nonzero) digits is 147, while the sum is 18.

The square root of 71000730 is about 8426.1930905955. The cubic root of 71000730 is about 414.0831940909.

Adding to 71000730 its reverse (3700017), we get a palindrome (74700747).

The spelling of 71000730 in words is "seventy-one million, seven hundred thirty", and thus it is an aban number.