71987964 has 24 divisors (see below), whose sum is σ = 172069968. Its totient is φ = 23410560.

The previous prime is 71987959. The next prime is 71987987. The reversal of 71987964 is 46978917.

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, 72667 + ... + 73650.

It is an arithmetic number, because the mean of its divisors is an integer number (7169582).

Almost surely, 2^71987964 is an apocalyptic number.

It is an amenable number.

71987964 is an abundant number, since it is smaller than the sum of its proper divisors (100082004).

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

71987964 is a wasteful number, since it uses less digits than its factorization.

71987964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146365 (or 146363 counting only the distinct ones).

The product of its digits is 762048, while the sum is 51.

The square root of 71987964 is about 8484.5721164947. The cubic root of 71987964 is about 415.9935819399.

The spelling of 71987964 in words is "seventy-one million, nine hundred eighty-seven thousand, nine hundred sixty-four".