82288821 has 4 divisors (see below), whose sum is σ = 109718432. Its totient is φ = 54859212.

The previous prime is 82288819. The next prime is 82288837. The reversal of 82288821 is 12888228.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 82288821 - 2¹ = 82288819 is a prime.

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 82288821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82288021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13714801 + ... + 13714806.

It is an arithmetic number, because the mean of its divisors is an integer number (27429608).

Almost surely, 2^82288821 is an apocalyptic number.

It is an amenable number.

82288821 is a deficient number, since it is larger than the sum of its proper divisors (27429611).

82288821 is a wasteful number, since it uses less digits than its factorization.

82288821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27429610.

The product of its digits is 32768, while the sum is 39.

The square root of 82288821 is about 9071.3185921342. The cubic root of 82288821 is about 434.9576230353.

The spelling of 82288821 in words is "eighty-two million, two hundred eighty-eight thousand, eight hundred twenty-one".