83981887 has 16 divisors (see below), whose sum is σ = 98468352. Its totient is φ = 70773120.

The previous prime is 83981861. The next prime is 83981893. The reversal of 83981887 is 78818938.

It is not a de Polignac number, because 83981887 - 2¹¹ = 83979839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83981837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9178 + ... + 15880.

It is an arithmetic number, because the mean of its divisors is an integer number (6154272).

Almost surely, 2^83981887 is an apocalyptic number.

83981887 is a deficient number, since it is larger than the sum of its proper divisors (14486465).

83981887 is a wasteful number, since it uses less digits than its factorization.

83981887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6798.

The product of its digits is 774144, while the sum is 52.

The square root of 83981887 is about 9164.1631914758. The cubic root of 83981887 is about 437.9204330632.

The spelling of 83981887 in words is "eighty-three million, nine hundred eighty-one thousand, eight hundred eighty-seven".