82897821 has 6 divisors (see below), whose sum is σ = 119741310. Its totient is φ = 55265208.

The previous prime is 82897811. The next prime is 82897823. The reversal of 82897821 is 12879828.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 78322500 + 4575321 = 8850^2 + 2139^2 .

It is not a de Polignac number, because 82897821 - 2¹⁴ = 82881437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82897823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4605426 + ... + 4605443.

It is an arithmetic number, because the mean of its divisors is an integer number (19956885).

Almost surely, 2^82897821 is an apocalyptic number.

It is an amenable number.

82897821 is a deficient number, since it is larger than the sum of its proper divisors (36843489).

82897821 is a wasteful number, since it uses less digits than its factorization.

82897821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9210875 (or 9210872 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 82897821 is about 9104.8240510182. The cubic root of 82897821 is about 436.0279928300.

It can be divided in two parts, 8289 and 7821, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 82897821 in words is "eighty-two million, eight hundred ninety-seven thousand, eight hundred twenty-one".