71638860 has 48 divisors (see below), whose sum is σ = 205261056. Its totient is φ = 18658752.

The previous prime is 71638841. The next prime is 71638883. The reversal of 71638860 is 6883617.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11304 + ... + 16463.

It is an arithmetic number, because the mean of its divisors is an integer number (4276272).

Almost surely, 2^71638860 is an apocalyptic number.

It is an amenable number.

71638860 is an abundant number, since it is smaller than the sum of its proper divisors (133622196).

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

71638860 is a wasteful number, since it uses less digits than its factorization.

71638860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27822 (or 27820 counting only the distinct ones).

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

The square root of 71638860 is about 8463.9742438171. The cubic root of 71638860 is about 415.3200415080.

The spelling of 71638860 in words is "seventy-one million, six hundred thirty-eight thousand, eight hundred sixty".