71003780 has 12 divisors (see below), whose sum is σ = 149107980. Its totient is φ = 28401504.

The previous prime is 71003753. The next prime is 71003813. The reversal of 71003780 is 8730017.

It can be written as a sum of positive squares in 2 ways, for example, as 28987456 + 42016324 = 5384^2 + 6482^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1775075 + ... + 1775114.

It is an arithmetic number, because the mean of its divisors is an integer number (12425665).

Almost surely, 2^71003780 is an apocalyptic number.

It is an amenable number.

71003780 is an abundant number, since it is smaller than the sum of its proper divisors (78104200).

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

71003780 is a wasteful number, since it uses less digits than its factorization.

71003780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3550198 (or 3550196 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 71003780 is about 8426.3740719244. The cubic root of 71003780 is about 414.0891233054.

Adding to 71003780 its reverse (8730017), we get a palindrome (79733797).

The spelling of 71003780 in words is "seventy-one million, three thousand, seven hundred eighty".