83815985 has 16 divisors (see below), whose sum is σ = 109933632. Its totient is φ = 60840000.

The previous prime is 83815981. The next prime is 83816009. The reversal of 83815985 is 58951838.

It is not a de Polignac number, because 83815985 - 2² = 83815981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83815981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36110 + ... + 38360.

It is an arithmetic number, because the mean of its divisors is an integer number (6870852).

Almost surely, 2^83815985 is an apocalyptic number.

It is an amenable number.

83815985 is a deficient number, since it is larger than the sum of its proper divisors (26117647).

83815985 is a wasteful number, since it uses less digits than its factorization.

83815985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2944.

The product of its digits is 345600, while the sum is 47.

The square root of 83815985 is about 9155.1070447046. The cubic root of 83815985 is about 437.6318796981.

The spelling of 83815985 in words is "eighty-three million, eight hundred fifteen thousand, nine hundred eighty-five".