87639319 has 4 divisors (see below), whose sum is σ = 87699744. Its totient is φ = 87578896.

The previous prime is 87639281. The next prime is 87639323. The reversal of 87639319 is 91393678.

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 87639319 - 2¹⁵ = 87606551 is a prime.

It is a super-2 number, since 2×87639319² = 15361300469567522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87639329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27982 + ... + 30955.

It is an arithmetic number, because the mean of its divisors is an integer number (21924936).

Almost surely, 2^87639319 is an apocalyptic number.

87639319 is a deficient number, since it is larger than the sum of its proper divisors (60425).

87639319 is a wasteful number, since it uses less digits than its factorization.

87639319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60424.

The product of its digits is 244944, while the sum is 46.

The square root of 87639319 is about 9361.5874188088. The cubic root of 87639319 is about 444.1874985898.

The spelling of 87639319 in words is "eighty-seven million, six hundred thirty-nine thousand, three hundred nineteen".