82082721 has 8 divisors (see below), whose sum is σ = 125078464. Its totient is φ = 46904400.

The previous prime is 82082713. The next prime is 82082729. The reversal of 82082721 is 12728028.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (82082713) and next prime (82082729).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 82082721 - 2³ = 82082713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82082729) 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, 1954330 + ... + 1954371.

It is an arithmetic number, because the mean of its divisors is an integer number (15634808).

Almost surely, 2^82082721 is an apocalyptic number.

It is an amenable number.

82082721 is a deficient number, since it is larger than the sum of its proper divisors (42995743).

82082721 is a wasteful number, since it uses less digits than its factorization.

82082721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3908711.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 82082721 is about 9059.9514899364. The cubic root of 82082721 is about 434.5941888509.

The spelling of 82082721 in words is "eighty-two million, eighty-two thousand, seven hundred twenty-one".