71249812 has 12 divisors (see below), whose sum is σ = 125831860. Its totient is φ = 35297856.

The previous prime is 71249809. The next prime is 71249819. The reversal of 71249812 is 21894217.

It can be written as a sum of positive squares in 2 ways, for example, as 33131536 + 38118276 = 5756^2 + 6174^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71249819) 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, 81273 + ... + 82144.

Almost surely, 2^71249812 is an apocalyptic number.

It is an amenable number.

71249812 is a deficient number, since it is larger than the sum of its proper divisors (54582048).

71249812 is a wasteful number, since it uses less digits than its factorization.

71249812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163530 (or 163528 counting only the distinct ones).

The product of its digits is 8064, while the sum is 34.

The square root of 71249812 is about 8440.9603719008. The cubic root of 71249812 is about 414.5668524670.

The spelling of 71249812 in words is "seventy-one million, two hundred forty-nine thousand, eight hundred twelve".