71638988 has 12 divisors (see below), whose sum is σ = 127086120. Its totient is φ = 35328672.

The previous prime is 71638981. The next prime is 71638999. The reversal of 71638988 is 88983617.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (71638981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122378 + ... + 122961.

It is an arithmetic number, because the mean of its divisors is an integer number (10590510).

Almost surely, 2^71638988 is an apocalyptic number.

It is an amenable number.

71638988 is a deficient number, since it is larger than the sum of its proper divisors (55447132).

71638988 is a wasteful number, since it uses less digits than its factorization.

71638988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245416 (or 245414 counting only the distinct ones).

The product of its digits is 580608, while the sum is 50.

The square root of 71638988 is about 8463.9818052734. The cubic root of 71638988 is about 415.3202888641.

The spelling of 71638988 in words is "seventy-one million, six hundred thirty-eight thousand, nine hundred eighty-eight".