71905689 has 24 divisors (see below), whose sum is σ = 107350152. Its totient is φ = 46344960.

The previous prime is 71905679. The next prime is 71905711. The reversal of 71905689 is 98650917.

It can be written as a sum of positive squares in 4 ways, for example, as 5760000 + 66145689 = 2400^2 + 8133^2 .

It is not a de Polignac number, because 71905689 - 2¹⁷ = 71774617 is a prime.

It is a super-2 number, since 2×71905689² = 10340856221129442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71905609) 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 23 ways as a sum of consecutive naturals, for example, 59677 + ... + 60869.

It is an arithmetic number, because the mean of its divisors is an integer number (4472923).

Almost surely, 2^71905689 is an apocalyptic number.

It is an amenable number.

71905689 is a deficient number, since it is larger than the sum of its proper divisors (35444463).

71905689 is a wasteful number, since it uses less digits than its factorization.

71905689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1417 (or 1414 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 71905689 is about 8479.7222242241. The cubic root of 71905689 is about 415.8350419228.

The spelling of 71905689 in words is "seventy-one million, nine hundred five thousand, six hundred eighty-nine".