83638191820 has 24 divisors (see below), whose sum is σ = 181696762800. Its totient is φ = 32301646272.

The previous prime is 83638191811. The next prime is 83638191821. The reversal of 83638191820 is 2819183638.

It is a super-2 number, since 2×83638191820² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (83638191821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72101310 + ... + 72102469.

It is an arithmetic number, because the mean of its divisors is an integer number (7570698450).

Almost surely, 2^83638191820 is an apocalyptic number.

It is an amenable number.

83638191820 is an abundant number, since it is smaller than the sum of its proper divisors (98058570980).

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

83638191820 is a wasteful number, since it uses less digits than its factorization.

83638191820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144203817 (or 144203815 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 49.

The spelling of 83638191820 in words is "eighty-three billion, six hundred thirty-eight million, one hundred ninety-one thousand, eight hundred twenty".