71395812 has 36 divisors (see below), whose sum is σ = 181486396. Its totient is φ = 23664960.

The previous prime is 71395811. The next prime is 71395817. The reversal of 71395812 is 21859317.

71395812 is a `hidden beast` number, since 71 + 3 + 9 + 581 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16842816 + 54552996 = 4104^2 + 7386^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×71395812² = 10194723942278688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (71395811) 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 11 ways as a sum of consecutive naturals, for example, 1038 + ... + 11994.

Almost surely, 2^71395812 is an apocalyptic number.

It is an amenable number.

71395812 is an abundant number, since it is smaller than the sum of its proper divisors (110090584).

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

71395812 is a wasteful number, since it uses less digits than its factorization.

71395812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11148 (or 11143 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 71395812 is about 8449.6042510877. The cubic root of 71395812 is about 414.8498261497.

The spelling of 71395812 in words is "seventy-one million, three hundred ninety-five thousand, eight hundred twelve".