82638381 has 8 divisors (see below), whose sum is σ = 125925184. Its totient is φ = 47221920.

The previous prime is 82638323. The next prime is 82638383. The reversal of 82638381 is 18383628.

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

It is not a de Polignac number, because 82638381 - 2⁶ = 82638317 is a prime.

It is a super-2 number, since 2×82638381² = 13658204028602322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82638383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1967560 + ... + 1967601.

It is an arithmetic number, because the mean of its divisors is an integer number (15740648).

Almost surely, 2^82638381 is an apocalyptic number.

It is an amenable number.

82638381 is a deficient number, since it is larger than the sum of its proper divisors (43286803).

82638381 is a wasteful number, since it uses less digits than its factorization.

82638381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3935171.

The product of its digits is 55296, while the sum is 39.

The square root of 82638381 is about 9090.5654939613. The cubic root of 82638381 is about 435.5726478519.

The spelling of 82638381 in words is "eighty-two million, six hundred thirty-eight thousand, three hundred eighty-one".