83857635487 has 4 divisors (see below), whose sum is σ = 86749278120. Its totient is φ = 80965992856.

The previous prime is 83857635451. The next prime is 83857635523. The reversal of 83857635487 is 78453675838.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (83857635451) and next prime (83857635523).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83857635487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83857635287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1445821273 + ... + 1445821330.

It is an arithmetic number, because the mean of its divisors is an integer number (21687319530).

Almost surely, 2^83857635487 is an apocalyptic number.

83857635487 is a deficient number, since it is larger than the sum of its proper divisors (2891642633).

83857635487 is a wasteful number, since it uses less digits than its factorization.

83857635487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2891642632.

The product of its digits is 135475200, while the sum is 64.

The spelling of 83857635487 in words is "eighty-three billion, eight hundred fifty-seven million, six hundred thirty-five thousand, four hundred eighty-seven".