71638806 has 16 divisors (see below), whose sum is σ = 144000000. Its totient is φ = 23759208.

The previous prime is 71638789. The next prime is 71638823. The reversal of 71638806 is 60883617.

It is an interprime number because it is at equal distance from previous prime (71638789) and next prime (71638823).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28806 + ... + 31193.

It is an arithmetic number, because the mean of its divisors is an integer number (9000000).

Almost surely, 2^71638806 is an apocalyptic number.

71638806 is an abundant number, since it is smaller than the sum of its proper divisors (72361194).

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

71638806 is a wasteful number, since it uses less digits than its factorization.

71638806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60203.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 71638806 is about 8463.9710538257. The cubic root of 71638806 is about 415.3199371545.

The spelling of 71638806 in words is "seventy-one million, six hundred thirty-eight thousand, eight hundred six".