82121716 has 12 divisors (see below), whose sum is σ = 144544932. Its totient is φ = 40823168.

The previous prime is 82121639. The next prime is 82121719. The reversal of 82121716 is 61712128.

It can be written as a sum of positive squares in 2 ways, for example, as 77264100 + 4857616 = 8790^2 + 2204^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82121719) 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, 58645 + ... + 60028.

It is an arithmetic number, because the mean of its divisors is an integer number (12045411).

Almost surely, 2^82121716 is an apocalyptic number.

It is an amenable number.

82121716 is a deficient number, since it is larger than the sum of its proper divisors (62423216).

82121716 is a wasteful number, since it uses less digits than its factorization.

82121716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118850 (or 118848 counting only the distinct ones).

The product of its digits is 1344, while the sum is 28.

The square root of 82121716 is about 9062.1032878687. The cubic root of 82121716 is about 434.6629987751.

The spelling of 82121716 in words is "eighty-two million, one hundred twenty-one thousand, seven hundred sixteen".