87212665 has 16 divisors (see below), whose sum is σ = 110533248. Its totient is φ = 65925376.

The previous prime is 87212659. The next prime is 87212687. The reversal of 87212665 is 56621278.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 87212665 - 2¹⁷ = 87081593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4977 + ... + 14113.

It is an arithmetic number, because the mean of its divisors is an integer number (6908328).

Almost surely, 2^87212665 is an apocalyptic number.

It is an amenable number.

87212665 is a deficient number, since it is larger than the sum of its proper divisors (23320583).

87212665 is a wasteful number, since it uses less digits than its factorization.

87212665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9248.

The product of its digits is 40320, while the sum is 37.

The square root of 87212665 is about 9338.7721355647. The cubic root of 87212665 is about 443.4655138805.

The spelling of 87212665 in words is "eighty-seven million, two hundred twelve thousand, six hundred sixty-five".