82120637 has 4 divisors (see below), whose sum is σ = 82154460. Its totient is φ = 82086816.

The previous prime is 82120631. The next prime is 82120667. The reversal of 82120637 is 73602128.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10023556 + 72097081 = 3166^2 + 8491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82120637 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 (82120631) 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, 12962 + ... + 18227.

It is an arithmetic number, because the mean of its divisors is an integer number (20538615).

Almost surely, 2^82120637 is an apocalyptic number.

It is an amenable number.

82120637 is a deficient number, since it is larger than the sum of its proper divisors (33823).

82120637 is a wasteful number, since it uses less digits than its factorization.

82120637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33822.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 82120637 is about 9062.0437540325. The cubic root of 82120637 is about 434.6610950828.

The spelling of 82120637 in words is "eighty-two million, one hundred twenty thousand, six hundred thirty-seven".