83145840 has 40 divisors (see below), whose sum is σ = 257752848. Its totient is φ = 22172160.

The previous prime is 83145833. The next prime is 83145863. The reversal of 83145840 is 4854138.

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 172981 + ... + 173460.

Almost surely, 2^83145840 is an apocalyptic number.

83145840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

83145840 is an abundant number, since it is smaller than the sum of its proper divisors (174607008).

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

83145840 is a wasteful number, since it uses less digits than its factorization.

83145840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346457 (or 346451 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 83145840 is about 9118.4340760900. The cubic root of 83145840 is about 436.4624053570.

Adding to 83145840 its reverse (4854138), we get a palindrome (87999978).

The spelling of 83145840 in words is "eighty-three million, one hundred forty-five thousand, eight hundred forty".