71249816 has 32 divisors (see below), whose sum is σ = 148219200. Its totient is φ = 31835040.

The previous prime is 71249809. The next prime is 71249819. The reversal of 71249816 is 61894217.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 71249816.

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 7 ways as a sum of consecutive naturals, for example, 1670 + ... + 12053.

It is an arithmetic number, because the mean of its divisors is an integer number (4631850).

Almost surely, 2^71249816 is an apocalyptic number.

It is an amenable number.

71249816 is an abundant number, since it is smaller than the sum of its proper divisors (76969384).

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

71249816 is a wasteful number, since it uses less digits than its factorization.

71249816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13799 (or 13795 counting only the distinct ones).

The product of its digits is 24192, while the sum is 38.

The square root of 71249816 is about 8440.9606088407. The cubic root of 71249816 is about 414.5668602250.

The spelling of 71249816 in words is "seventy-one million, two hundred forty-nine thousand, eight hundred sixteen".