87381613 has 4 divisors (see below), whose sum is σ = 95325408. Its totient is φ = 79437820.

The previous prime is 87381587. The next prime is 87381629. The reversal of 87381613 is 31618378.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 87381613 - 2⁹ = 87381101 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 (87381643) 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, 3971881 + ... + 3971902.

It is an arithmetic number, because the mean of its divisors is an integer number (23831352).

Almost surely, 2^87381613 is an apocalyptic number.

It is an amenable number.

87381613 is a deficient number, since it is larger than the sum of its proper divisors (7943795).

87381613 is a wasteful number, since it uses less digits than its factorization.

87381613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7943794.

The product of its digits is 24192, while the sum is 37.

The square root of 87381613 is about 9347.8132737020. The cubic root of 87381613 is about 443.7516889971.

The spelling of 87381613 in words is "eighty-seven million, three hundred eighty-one thousand, six hundred thirteen".