83109840 has 80 divisors (see below), whose sum is σ = 281071296. Its totient is φ = 20147200.

The previous prime is 83109827. The next prime is 83109863. The reversal of 83109840 is 4890138.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13101 + ... + 18380.

Almost surely, 2^83109840 is an apocalyptic number.

83109840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

83109840 is an abundant number, since it is smaller than the sum of its proper divisors (197961456).

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

83109840 is a wasteful number, since it uses less digits than its factorization.

83109840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31508 (or 31502 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 83109840 is about 9116.4598392139. The cubic root of 83109840 is about 436.3994039495.

Adding to 83109840 its reverse (4890138), we get a palindrome (87999978).

It can be divided in two parts, 831098 and 40, that added together give a palindrome (831138).

The spelling of 83109840 in words is "eighty-three million, one hundred nine thousand, eight hundred forty".