71505012 has 12 divisors (see below), whose sum is σ = 166845056. Its totient is φ = 23835000.

The previous prime is 71505011. The next prime is 71505017. The reversal of 71505012 is 21050517.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×71505012² = 10225933482240288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71505012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71505011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2979364 + ... + 2979387.

Almost surely, 2^71505012 is an apocalyptic number.

It is an amenable number.

71505012 is an abundant number, since it is smaller than the sum of its proper divisors (95340044).

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

71505012 is a wasteful number, since it uses less digits than its factorization.

71505012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5958758 (or 5958756 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 71505012 is about 8456.0636232233. The cubic root of 71505012 is about 415.0612228833.

Adding to 71505012 its reverse (21050517), we get a palindrome (92555529).

The spelling of 71505012 in words is "seventy-one million, five hundred five thousand, twelve".