71988993 has 12 divisors (see below), whose sum is σ = 107835728. Its totient is φ = 47992500.

The previous prime is 71988953. The next prime is 71989019. The reversal of 71988993 is 39988917.

It is not a de Polignac number, because 71988993 - 2¹³ = 71980801 is a prime.

It is a super-2 number, since 2×71988993² = 10364830226308098, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71988953) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 147883 + ... + 148368.

Almost surely, 2^71988993 is an apocalyptic number.

It is an amenable number.

71988993 is a deficient number, since it is larger than the sum of its proper divisors (35846735).

71988993 is an equidigital number, since it uses as much as digits as its factorization.

71988993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296266 (or 296254 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 71988993 is about 8484.6327557532. The cubic root of 71988993 is about 415.9955640090.

The spelling of 71988993 in words is "seventy-one million, nine hundred eighty-eight thousand, nine hundred ninety-three".