82121708 has 6 divisors (see below), whose sum is σ = 143712996. Its totient is φ = 41060852.

The previous prime is 82121639. The next prime is 82121719. The reversal of 82121708 is 80712128.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265210 + ... + 10265217.

It is an arithmetic number, because the mean of its divisors is an integer number (23952166).

Almost surely, 2^82121708 is an apocalyptic number.

It is an amenable number.

82121708 is a deficient number, since it is larger than the sum of its proper divisors (61591288).

82121708 is a wasteful number, since it uses less digits than its factorization.

82121708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20530431 (or 20530429 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 82121708 is about 9062.1028464700. The cubic root of 82121708 is about 434.6629846607.

The spelling of 82121708 in words is "eighty-two million, one hundred twenty-one thousand, seven hundred eight".