82621247 has 8 divisors (see below), whose sum is σ = 83484672. Its totient is φ = 81761400.

The previous prime is 82621243. The next prime is 82621249. The reversal of 82621247 is 74212628.

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 82621247 - 2² = 82621243 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82621243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79622 + ... + 80652.

It is an arithmetic number, because the mean of its divisors is an integer number (10435584).

Almost surely, 2^82621247 is an apocalyptic number.

82621247 is a deficient number, since it is larger than the sum of its proper divisors (863425).

82621247 is a wasteful number, since it uses less digits than its factorization.

82621247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789.

The product of its digits is 10752, while the sum is 32.

The square root of 82621247 is about 9089.6230394885. The cubic root of 82621247 is about 435.5425423186.

The spelling of 82621247 in words is "eighty-two million, six hundred twenty-one thousand, two hundred forty-seven".