87056665 has 8 divisors (see below), whose sum is σ = 105427080. Its totient is φ = 69005952.

The previous prime is 87056663. The next prime is 87056681. The reversal of 87056665 is 56665078.

It can be written as a sum of positive squares in 4 ways, for example, as 4173849 + 82882816 = 2043^2 + 9104^2 .

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 87056665 - 2¹ = 87056663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87056663) 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, 79324 + ... + 80413.

It is an arithmetic number, because the mean of its divisors is an integer number (13178385).

Almost surely, 2^87056665 is an apocalyptic number.

It is an amenable number.

87056665 is a deficient number, since it is larger than the sum of its proper divisors (18370415).

87056665 is a wasteful number, since it uses less digits than its factorization.

87056665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159851.

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 87056665 is about 9330.4161214814. The cubic root of 87056665 is about 443.2009425605.

The spelling of 87056665 in words is "eighty-seven million, fifty-six thousand, six hundred sixty-five".