82047721 has 8 divisors (see below), whose sum is σ = 94191104. Its totient is φ = 70009920.

The previous prime is 82047703. The next prime is 82047733. The reversal of 82047721 is 12774028.

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 82047721 - 2¹⁷ = 81916649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82047751) 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, 24720 + ... + 27841.

It is an arithmetic number, because the mean of its divisors is an integer number (11773888).

Almost surely, 2^82047721 is an apocalyptic number.

It is an amenable number.

82047721 is a deficient number, since it is larger than the sum of its proper divisors (12143383).

82047721 is a wasteful number, since it uses less digits than its factorization.

82047721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52791.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 82047721 is about 9058.0197063155. The cubic root of 82047721 is about 434.5324098760.

The spelling of 82047721 in words is "eighty-two million, forty-seven thousand, seven hundred twenty-one".