71928839 has 2 divisors, whose sum is σ = 71928840. Its totient is φ = 71928838.

The previous prime is 71928827. The next prime is 71928841. The reversal of 71928839 is 93882917.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71928839 is a prime.

Together with 71928841, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 71928793 and 71928802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71928869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35964419 + 35964420.

It is an arithmetic number, because the mean of its divisors is an integer number (35964420).

Almost surely, 2^71928839 is an apocalyptic number.

71928839 is a deficient number, since it is larger than the sum of its proper divisors (1).

71928839 is an equidigital number, since it uses as much as digits as its factorization.

71928839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 47.

The square root of 71928839 is about 8481.0871355033. The cubic root of 71928839 is about 415.8796630946.

The spelling of 71928839 in words is "seventy-one million, nine hundred twenty-eight thousand, eight hundred thirty-nine".