87320681 has 4 divisors (see below), whose sum is σ = 99795072. Its totient is φ = 74846292.

The previous prime is 87320669. The next prime is 87320729. The reversal of 87320681 is 18602378.

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 a cyclic number.

It is not a de Polignac number, because 87320681 - 2⁶ = 87320617 is a prime.

It is a super-2 number, since 2×87320681² = 15249802660607522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87320081) 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, 6237185 + ... + 6237198.

It is an arithmetic number, because the mean of its divisors is an integer number (24948768).

Almost surely, 2^87320681 is an apocalyptic number.

It is an amenable number.

87320681 is a deficient number, since it is larger than the sum of its proper divisors (12474391).

87320681 is a wasteful number, since it uses less digits than its factorization.

87320681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12474390.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 87320681 is about 9344.5535473879. The cubic root of 87320681 is about 443.6485209728.

The spelling of 87320681 in words is "eighty-seven million, three hundred twenty thousand, six hundred eighty-one".