83870605 has 48 divisors (see below), whose sum is σ = 133585200. Its totient is φ = 49932288.

The previous prime is 83870603. The next prime is 83870609. The reversal of 83870605 is 50607838.

83870605 = 196² + 197² + ... + 637².

It can be written as a sum of positive squares in 8 ways, for example, as 3337929 + 80532676 = 1827^2 + 8974^2 .

It is not a de Polignac number, because 83870605 - 2¹ = 83870603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83870603) 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 47 ways as a sum of consecutive naturals, for example, 53371 + ... + 54919.

It is an arithmetic number, because the mean of its divisors is an integer number (2783025).

Almost surely, 2^83870605 is an apocalyptic number.

83870605 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

83870605 is a deficient number, since it is larger than the sum of its proper divisors (49714595).

83870605 is a wasteful number, since it uses less digits than its factorization.

83870605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1598 (or 1591 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 83870605 is about 9158.0895933595. The cubic root of 83870605 is about 437.7269222797.

The spelling of 83870605 in words is "eighty-three million, eight hundred seventy thousand, six hundred five".