71985660 has 48 divisors (see below), whose sum is σ = 205371936. Its totient is φ = 18833152.

The previous prime is 71985659. The next prime is 71985677. The reversal of 71985660 is 6658917.

It is a congruent number.

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, 8139 + ... + 14498.

It is an arithmetic number, because the mean of its divisors is an integer number (4278582).

Almost surely, 2^71985660 is an apocalyptic number.

It is an amenable number.

71985660 is an abundant number, since it is smaller than the sum of its proper divisors (133386276).

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

71985660 is a wasteful number, since it uses less digits than its factorization.

71985660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22702 (or 22700 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 71985660 is about 8484.4363395573. The cubic root of 71985660 is about 415.9891438858.

The spelling of 71985660 in words is "seventy-one million, nine hundred eighty-five thousand, six hundred sixty".