71899988 has 12 divisors (see below), whose sum is σ = 125901972. Its totient is φ = 35928000.

The previous prime is 71899973. The next prime is 71900051. The reversal of 71899988 is 88999817.

It can be written as a sum of positive squares in 2 ways, for example, as 6160324 + 65739664 = 2482^2 + 8108^2 .

It is a congruent number.

It is an unprimeable number.

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, 3488 + ... + 12488.

It is an arithmetic number, because the mean of its divisors is an integer number (10491831).

Almost surely, 2^71899988 is an apocalyptic number.

It is an amenable number.

71899988 is a deficient number, since it is larger than the sum of its proper divisors (54001984).

71899988 is a wasteful number, since it uses less digits than its factorization.

71899988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11002 (or 11000 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 59.

The square root of 71899988 is about 8479.3860626817. The cubic root of 71899988 is about 415.8240518872.

The spelling of 71899988 in words is "seventy-one million, eight hundred ninety-nine thousand, nine hundred eighty-eight".