71919928 has 16 divisors (see below), whose sum is σ = 142782480. Its totient is φ = 33844608.

The previous prime is 71919923. The next prime is 71919937. The reversal of 71919928 is 82991917.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71919923) 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 3 ways as a sum of consecutive naturals, for example, 264276 + ... + 264547.

It is an arithmetic number, because the mean of its divisors is an integer number (8923905).

Almost surely, 2^71919928 is an apocalyptic number.

It is an amenable number.

71919928 is a deficient number, since it is larger than the sum of its proper divisors (70862552).

71919928 is a wasteful number, since it uses less digits than its factorization.

71919928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528846 (or 528842 counting only the distinct ones).

The product of its digits is 81648, while the sum is 46.

The square root of 71919928 is about 8480.5617738449. The cubic root of 71919928 is about 415.8624884501.

The spelling of 71919928 in words is "seventy-one million, nine hundred nineteen thousand, nine hundred twenty-eight".