71215512 has 32 divisors (see below), whose sum is σ = 178329600. Its totient is φ = 23699744.

The previous prime is 71215511. The next prime is 71215531. The reversal of 71215512 is 21551217.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71215511) 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 7 ways as a sum of consecutive naturals, for example, 15193 + ... + 19319.

It is an arithmetic number, because the mean of its divisors is an integer number (5572800).

Almost surely, 2^71215512 is an apocalyptic number.

It is an amenable number.

71215512 is an abundant number, since it is smaller than the sum of its proper divisors (107114088).

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

71215512 is a wasteful number, since it uses less digits than its factorization.

71215512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4855 (or 4851 counting only the distinct ones).

The product of its digits is 700, while the sum is 24.

The square root of 71215512 is about 8438.9283679861. The cubic root of 71215512 is about 414.5003169677.

Adding to 71215512 its reverse (21551217), we get a palindrome (92766729).

The spelling of 71215512 in words is "seventy-one million, two hundred fifteen thousand, five hundred twelve".