83172840 has 64 divisors (see below), whose sum is σ = 264202560. Its totient is φ = 20874240.

The previous prime is 83172839. The next prime is 83172871. The reversal of 83172840 is 4827138.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18346 + ... + 22425.

It is an arithmetic number, because the mean of its divisors is an integer number (4128165).

Almost surely, 2^83172840 is an apocalyptic number.

It is an amenable number.

83172840 is an abundant number, since it is smaller than the sum of its proper divisors (181029720).

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

83172840 is a wasteful number, since it uses less digits than its factorization.

83172840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40802 (or 40798 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 83172840 is about 9119.9144732832. The cubic root of 83172840 is about 436.5096444796.

Adding to 83172840 its reverse (4827138), we get a palindrome (87999978).

The spelling of 83172840 in words is "eighty-three million, one hundred seventy-two thousand, eight hundred forty".