82782721 has 8 divisors (see below), whose sum is σ = 96021440. Its totient is φ = 69897168.

The previous prime is 82782719. The next prime is 82782737. The reversal of 82782721 is 12728728.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 82782721 - 2¹ = 82782719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82782751) 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, 87786 + ... + 88723.

It is an arithmetic number, because the mean of its divisors is an integer number (12002680).

Almost surely, 2^82782721 is an apocalyptic number.

It is an amenable number.

82782721 is a deficient number, since it is larger than the sum of its proper divisors (13238719).

82782721 is a wasteful number, since it uses less digits than its factorization.

82782721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176583.

The product of its digits is 25088, while the sum is 37.

The square root of 82782721 is about 9098.5010303896. The cubic root of 82782721 is about 435.8260974255.

The spelling of 82782721 in words is "eighty-two million, seven hundred eighty-two thousand, seven hundred twenty-one".