71971404 has 36 divisors (see below), whose sum is σ = 178401384. Its totient is φ = 22578176.

The previous prime is 71971391. The next prime is 71971409. The reversal of 71971404 is 40417917.

It is not an unprimeable number, because it can be changed into a prime (71971409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6909 + ... + 13844.

It is an arithmetic number, because the mean of its divisors is an integer number (4955594).

Almost surely, 2^71971404 is an apocalyptic number.

It is an amenable number.

71971404 is an abundant number, since it is smaller than the sum of its proper divisors (106429980).

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

71971404 is a wasteful number, since it uses less digits than its factorization.

71971404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20794 (or 20775 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 71971404 is about 8483.5961714358. The cubic root of 71971404 is about 415.9616813201.

The spelling of 71971404 in words is "seventy-one million, nine hundred seventy-one thousand, four hundred four".