82978638 has 8 divisors (see below), whose sum is σ = 165957288. Its totient is φ = 27659544.

The previous prime is 82978631. The next prime is 82978673. The reversal of 82978638 is 83687928.

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

82978638 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82978631) 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, 6914881 + ... + 6914892.

It is an arithmetic number, because the mean of its divisors is an integer number (20744661).

Almost surely, 2^82978638 is an apocalyptic number.

82978638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82978638 is a wasteful number, since it uses less digits than its factorization.

82978638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13829778.

The product of its digits is 1161216, while the sum is 51.

The square root of 82978638 is about 9109.2611116380. The cubic root of 82978638 is about 436.1696412222.

The spelling of 82978638 in words is "eighty-two million, nine hundred seventy-eight thousand, six hundred thirty-eight".