71043420 has 48 divisors (see below), whose sum is σ = 227340288. Its totient is φ = 16238400.

The previous prime is 71043409. The next prime is 71043433. The reversal of 71043420 is 2434017.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84156 + ... + 84995.

It is an arithmetic number, because the mean of its divisors is an integer number (4736256).

Almost surely, 2^71043420 is an apocalyptic number.

71043420 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

71043420 is an abundant number, since it is smaller than the sum of its proper divisors (156296868).

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

71043420 is a wasteful number, since it uses less digits than its factorization.

71043420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169170 (or 169168 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 71043420 is about 8428.7258823621. The cubic root of 71043420 is about 414.1661682137.

Adding to 71043420 its reverse (2434017), we get a palindrome (73477437).

The spelling of 71043420 in words is "seventy-one million, forty-three thousand, four hundred twenty".