71906289 has 24 divisors (see below), whose sum is σ = 118654272. Its totient is φ = 37926720.

The previous prime is 71906273. The next prime is 71906291. The reversal of 71906289 is 98260917.

It is not a de Polignac number, because 71906289 - 2⁴ = 71906273 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71906289.

It is not an unprimeable number, because it can be changed into a prime (71906249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6582 + ... + 13679.

It is an arithmetic number, because the mean of its divisors is an integer number (4943928).

Almost surely, 2^71906289 is an apocalyptic number.

It is an amenable number.

71906289 is a deficient number, since it is larger than the sum of its proper divisors (46747983).

71906289 is a wasteful number, since it uses less digits than its factorization.

71906289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20297 (or 20284 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 71906289 is about 8479.7576026677. The cubic root of 71906289 is about 415.8361985319.

The spelling of 71906289 in words is "seventy-one million, nine hundred six thousand, two hundred eighty-nine".