71989835 has 4 divisors (see below), whose sum is σ = 86387808. Its totient is φ = 57591864.

The previous prime is 71989831. The next prime is 71989837. The reversal of 71989835 is 53898917.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 53898917 = 193 ⋅279269.

It is a cyclic number.

It is not a de Polignac number, because 71989835 - 2² = 71989831 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71989831) 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 3 ways as a sum of consecutive naturals, for example, 7198979 + ... + 7198988.

It is an arithmetic number, because the mean of its divisors is an integer number (21596952).

Almost surely, 2^71989835 is an apocalyptic number.

71989835 is a deficient number, since it is larger than the sum of its proper divisors (14397973).

71989835 is a wasteful number, since it uses less digits than its factorization.

71989835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14397972.

The product of its digits is 544320, while the sum is 50.

The square root of 71989835 is about 8484.6823747268. The cubic root of 71989835 is about 415.9971858630.

The spelling of 71989835 in words is "seventy-one million, nine hundred eighty-nine thousand, eight hundred thirty-five".