87000005 has 4 divisors (see below), whose sum is σ = 104400012. Its totient is φ = 69600000.

The previous prime is 86999989. The next prime is 87000037. The reversal of 87000005 is 50000078.

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

It can be written as a sum of positive squares in 2 ways, for example, as 41383489 + 45616516 = 6433^2 + 6754^2 .

It is not a de Polignac number, because 87000005 - 2⁴ = 86999989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8699996 + ... + 8700005.

It is an arithmetic number, because the mean of its divisors is an integer number (26100003).

Almost surely, 2^87000005 is an apocalyptic number.

It is an amenable number.

87000005 is a deficient number, since it is larger than the sum of its proper divisors (17400007).

87000005 is a wasteful number, since it uses less digits than its factorization.

87000005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17400006.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 87000005 is about 9327.3793211169. The cubic root of 87000005 is about 443.1047706580.

The spelling of 87000005 in words is "eighty-seven million, five", and thus it is an aban number and an uban number.