83817987 has 32 divisors (see below), whose sum is σ = 131838720. Its totient is φ = 46811520.

The previous prime is 83817983. The next prime is 83817989. The reversal of 83817987 is 78971838.

It is not a de Polignac number, because 83817987 - 2² = 83817983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (83817983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21393 + ... + 25005.

It is an arithmetic number, because the mean of its divisors is an integer number (4119960).

Almost surely, 2^83817987 is an apocalyptic number.

83817987 is a deficient number, since it is larger than the sum of its proper divisors (48020733).

83817987 is a wasteful number, since it uses less digits than its factorization.

83817987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3683.

The product of its digits is 677376, while the sum is 51.

The square root of 83817987 is about 9155.2163819322. The cubic root of 83817987 is about 437.6353640455.

The spelling of 83817987 in words is "eighty-three million, eight hundred seventeen thousand, nine hundred eighty-seven".