71249988 has 12 divisors (see below), whose sum is σ = 166250000. Its totient is φ = 23749992.

The previous prime is 71249957. The next prime is 71249999. The reversal of 71249988 is 88994217.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2968738 + ... + 2968761.

Almost surely, 2^71249988 is an apocalyptic number.

It is an amenable number.

71249988 is an abundant number, since it is smaller than the sum of its proper divisors (95000012).

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

71249988 is a wasteful number, since it uses less digits than its factorization.

71249988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5937506 (or 5937504 counting only the distinct ones).

The product of its digits is 290304, while the sum is 48.

The square root of 71249988 is about 8440.9707972484. The cubic root of 71249988 is about 414.5671938185.

The spelling of 71249988 in words is "seventy-one million, two hundred forty-nine thousand, nine hundred eighty-eight".