87766221 has 8 divisors (see below), whose sum is σ = 118624960. Its totient is φ = 57709152.

The previous prime is 87766169. The next prime is 87766241. The reversal of 87766221 is 12266778.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87766221 - 2⁶ = 87766157 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 87766221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87766241) 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, 200161 + ... + 200598.

It is an arithmetic number, because the mean of its divisors is an integer number (14828120).

Almost surely, 2^87766221 is an apocalyptic number.

It is an amenable number.

87766221 is a deficient number, since it is larger than the sum of its proper divisors (30858739).

87766221 is a wasteful number, since it uses less digits than its factorization.

87766221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400835.

The product of its digits is 56448, while the sum is 39.

The square root of 87766221 is about 9368.3627705165. The cubic root of 87766221 is about 444.4017901403.

The spelling of 87766221 in words is "eighty-seven million, seven hundred sixty-six thousand, two hundred twenty-one".