71988587 has 24 divisors (see below), whose sum is σ = 84236880. Its totient is φ = 61300800.

The previous prime is 71988583. The next prime is 71988589. The reversal of 71988587 is 78588917.

It is a happy number.

It is not a de Polignac number, because 71988587 - 2² = 71988583 is a prime.

Its product of digits (1128960) is a multiple of the sum of its prime divisors (384).

It is not an unprimeable number, because it can be changed into a prime (71988583) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 397637 + ... + 397817.

It is an arithmetic number, because the mean of its divisors is an integer number (3509870).

Almost surely, 2^71988587 is an apocalyptic number.

71988587 is a deficient number, since it is larger than the sum of its proper divisors (12248293).

71988587 is a wasteful number, since it uses less digits than its factorization.

71988587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 384 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 53.

The square root of 71988587 is about 8484.6088301111. The cubic root of 71988587 is about 415.9947819704.

The spelling of 71988587 in words is "seventy-one million, nine hundred eighty-eight thousand, five hundred eighty-seven".