71971420 has 24 divisors (see below), whose sum is σ = 152233200. Its totient is φ = 28580352.

The previous prime is 71971409. The next prime is 71971423. The reversal of 71971420 is 2417917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71971423) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10165 + ... + 15724.

It is an arithmetic number, because the mean of its divisors is an integer number (6343050).

Almost surely, 2^71971420 is an apocalyptic number.

It is an amenable number.

71971420 is an abundant number, since it is smaller than the sum of its proper divisors (80261780).

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

71971420 is a wasteful number, since it uses less digits than its factorization.

71971420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26037 (or 26035 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 71971420 is about 8483.5971144321. The cubic root of 71971420 is about 415.9617121443.

The spelling of 71971420 in words is "seventy-one million, nine hundred seventy-one thousand, four hundred twenty".