71839428 has 12 divisors (see below), whose sum is σ = 167625360. Its totient is φ = 23946472.

The previous prime is 71839423. The next prime is 71839429. The reversal of 71839428 is 82493817.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 71839428.

It is not an unprimeable number, because it can be changed into a prime (71839423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2993298 + ... + 2993321.

It is an arithmetic number, because the mean of its divisors is an integer number (13968780).

Almost surely, 2^71839428 is an apocalyptic number.

It is an amenable number.

71839428 is an abundant number, since it is smaller than the sum of its proper divisors (95785932).

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

71839428 is a wasteful number, since it uses less digits than its factorization.

71839428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5986626 (or 5986624 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 71839428 is about 8475.8142971634. The cubic root of 71839428 is about 415.7072721826.

The spelling of 71839428 in words is "seventy-one million, eight hundred thirty-nine thousand, four hundred twenty-eight".