87489816839 has 4 divisors (see below), whose sum is σ = 87741949224. Its totient is φ = 87237684456.

The previous prime is 87489816823. The next prime is 87489816851. The reversal of 87489816839 is 93861898478.

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

It is a cyclic number.

It is not a de Polignac number, because 87489816839 - 2⁴ = 87489816823 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 (87489816859) 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, 126065672 + ... + 126066365.

It is an arithmetic number, because the mean of its divisors is an integer number (21935487306).

Almost surely, 2^87489816839 is an apocalyptic number.

87489816839 is a deficient number, since it is larger than the sum of its proper divisors (252132385).

87489816839 is a wasteful number, since it uses less digits than its factorization.

87489816839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252132384.

The product of its digits is 167215104, while the sum is 71.

The spelling of 87489816839 in words is "eighty-seven billion, four hundred eighty-nine million, eight hundred sixteen thousand, eight hundred thirty-nine".