83136987 has 12 divisors (see below), whose sum is σ = 127150920. Its totient is φ = 52164288.

The previous prime is 83136979. The next prime is 83137001. The reversal of 83136987 is 78963138.

It is a happy number.

It is not a de Polignac number, because 83136987 - 2³ = 83136979 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (83136187) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 271537 + ... + 271842.

It is an arithmetic number, because the mean of its divisors is an integer number (10595910).

Almost surely, 2^83136987 is an apocalyptic number.

83136987 is a deficient number, since it is larger than the sum of its proper divisors (44013933).

83136987 is a wasteful number, since it uses less digits than its factorization.

83136987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543402 (or 543399 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 83136987 is about 9117.9486179732. The cubic root of 83136987 is about 436.4469139473.

Subtracting from 83136987 its reverse (78963138), we obtain a square (4173849 = 2043²).

The spelling of 83136987 in words is "eighty-three million, one hundred thirty-six thousand, nine hundred eighty-seven".