83642636478 has 8 divisors (see below), whose sum is σ = 167285272968. Its totient is φ = 27880878824.

The previous prime is 83642636443. The next prime is 83642636503. The reversal of 83642636478 is 87463624638.

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

83642636478 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6970219701 + ... + 6970219712.

It is an arithmetic number, because the mean of its divisors is an integer number (20910659121).

Almost surely, 2^83642636478 is an apocalyptic number.

83642636478 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.

83642636478 is a wasteful number, since it uses less digits than its factorization.

83642636478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13940439418.

The product of its digits is 27869184, while the sum is 57.

The spelling of 83642636478 in words is "eighty-three billion, six hundred forty-two million, six hundred thirty-six thousand, four hundred seventy-eight".