87750665 has 8 divisors (see below), whose sum is σ = 108932040. Its totient is φ = 67779712.

The previous prime is 87750661. The next prime is 87750679. The reversal of 87750665 is 56605778.

It can be written as a sum of positive squares in 4 ways, for example, as 7038409 + 80712256 = 2653^2 + 8984^2 .

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 87750665 - 2² = 87750661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87750661) 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 7 ways as a sum of consecutive naturals, for example, 302444 + ... + 302733.

It is an arithmetic number, because the mean of its divisors is an integer number (13616505).

Almost surely, 2^87750665 is an apocalyptic number.

It is an amenable number.

87750665 is a deficient number, since it is larger than the sum of its proper divisors (21181375).

87750665 is a wasteful number, since it uses less digits than its factorization.

87750665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605211.

The product of its (nonzero) digits is 352800, while the sum is 44.

The square root of 87750665 is about 9367.5324926044. The cubic root of 87750665 is about 444.3755327995.

The spelling of 87750665 in words is "eighty-seven million, seven hundred fifty thousand, six hundred sixty-five".