83889891864 has 64 divisors (see below), whose sum is σ = 240544512000. Its totient is φ = 27061253280.

The previous prime is 83889891863. The next prime is 83889891931. The reversal of 83889891864 is 46819898838.

It is a super-2 number, since 2×83889891864² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 83889891792 and 83889891801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83889891863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6257484 + ... + 6270875.

It is an arithmetic number, because the mean of its divisors is an integer number (3758508000).

Almost surely, 2^83889891864 is an apocalyptic number.

It is an amenable number.

83889891864 is an abundant number, since it is smaller than the sum of its proper divisors (156654620136).

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

83889891864 is a wasteful number, since it uses less digits than its factorization.

83889891864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12528405 (or 12528395 counting only the distinct ones).

The product of its digits is 191102976, while the sum is 72.

The spelling of 83889891864 in words is "eighty-three billion, eight hundred eighty-nine million, eight hundred ninety-one thousand, eight hundred sixty-four".