83813868 has 36 divisors (see below), whose sum is σ = 212710680. Its totient is φ = 27826176.

The previous prime is 83813861. The next prime is 83813869. The reversal of 83813868 is 86831838.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (83813861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4723 + ... + 13781.

It is an arithmetic number, because the mean of its divisors is an integer number (5908630).

Almost surely, 2^83813868 is an apocalyptic number.

It is an amenable number.

83813868 is an abundant number, since it is smaller than the sum of its proper divisors (128896812).

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

83813868 is a wasteful number, since it uses less digits than its factorization.

83813868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9326 (or 9321 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 83813868 is about 9154.9914254466. The cubic root of 83813868 is about 437.6281951404.

It can be divided in two parts, 83813 and 868, that added together give a square (84681 = 291²).

The spelling of 83813868 in words is "eighty-three million, eight hundred thirteen thousand, eight hundred sixty-eight".