83287821 has 8 divisors (see below), whose sum is σ = 111331744. Its totient is φ = 55384560.

The previous prime is 83287801. The next prime is 83287823. The reversal of 83287821 is 12878238.

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

It is not a de Polignac number, because 83287821 - 2²² = 79093517 is a prime.

It is a super-2 number, since 2×83287821² = 13873722253856082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83287821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83287823) 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, 33775 + ... + 36156.

It is an arithmetic number, because the mean of its divisors is an integer number (13916468).

Almost surely, 2^83287821 is an apocalyptic number.

It is an amenable number.

83287821 is a deficient number, since it is larger than the sum of its proper divisors (28043923).

83287821 is a wasteful number, since it uses less digits than its factorization.

83287821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70331.

The product of its digits is 43008, while the sum is 39.

The square root of 83287821 is about 9126.2161381374. The cubic root of 83287821 is about 436.7107005171.

The spelling of 83287821 in words is "eighty-three million, two hundred eighty-seven thousand, eight hundred twenty-one".