82001638 has 4 divisors (see below), whose sum is σ = 123002460. Its totient is φ = 41000818.

The previous prime is 82001627. The next prime is 82001639. The reversal of 82001638 is 83610028.

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

82001638 is a modest number, since divided by 1638 gives 82 as remainder.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82001639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20500408 + ... + 20500411.

It is an arithmetic number, because the mean of its divisors is an integer number (30750615).

Almost surely, 2^82001638 is an apocalyptic number.

82001638 is a deficient number, since it is larger than the sum of its proper divisors (41000822).

82001638 is a wasteful number, since it uses less digits than its factorization.

82001638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41000821.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 82001638 is about 9055.4755811056. The cubic root of 82001638 is about 434.4510413465.

The spelling of 82001638 in words is "eighty-two million, one thousand, six hundred thirty-eight".