71638998456 has 32 divisors (see below), whose sum is σ = 179150515200. Its totient is φ = 23872596960.

The previous prime is 71638998451. The next prime is 71638998479. The reversal of 71638998456 is 65489983617.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71638998451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358746 + ... + 521513.

It is an arithmetic number, because the mean of its divisors is an integer number (5598453600).

Almost surely, 2^71638998456 is an apocalyptic number.

It is an amenable number.

71638998456 is an abundant number, since it is smaller than the sum of its proper divisors (107511516744).

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

71638998456 is a wasteful number, since it uses less digits than its factorization.

71638998456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883659 (or 883655 counting only the distinct ones).

The product of its digits is 78382080, while the sum is 66.

The spelling of 71638998456 in words is "seventy-one billion, six hundred thirty-eight million, nine hundred ninety-eight thousand, four hundred fifty-six".