87319691 has 8 divisors (see below), whose sum is σ = 88423440. Its totient is φ = 86220288.

The previous prime is 87319681. The next prime is 87319711. The reversal of 87319691 is 19691378.

87319691 = T₁₂₉₃ + T₁₂₉₄ + ... + T₁₃₈₉.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87319691 - 2¹⁰ = 87318667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87319621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59120 + ... + 60578.

It is an arithmetic number, because the mean of its divisors is an integer number (11052930).

Almost surely, 2^87319691 is an apocalyptic number.

87319691 is a deficient number, since it is larger than the sum of its proper divisors (1103749).

87319691 is a wasteful number, since it uses less digits than its factorization.

87319691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2173.

The product of its digits is 81648, while the sum is 44.

The square root of 87319691 is about 9344.5005752046. The cubic root of 87319691 is about 443.6468443417.

The spelling of 87319691 in words is "eighty-seven million, three hundred nineteen thousand, six hundred ninety-one".