87788209 has 4 divisors (see below), whose sum is σ = 88458480. Its totient is φ = 87117940.

The previous prime is 87788203. The next prime is 87788219. The reversal of 87788209 is 90288778.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87788209 - 2⁹ = 87787697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87788203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334939 + ... + 335200.

It is an arithmetic number, because the mean of its divisors is an integer number (22114620).

Almost surely, 2^87788209 is an apocalyptic number.

It is an amenable number.

87788209 is a deficient number, since it is larger than the sum of its proper divisors (670271).

87788209 is a wasteful number, since it uses less digits than its factorization.

87788209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670270.

The product of its (nonzero) digits is 451584, while the sum is 49.

The square root of 87788209 is about 9369.5362211798. The cubic root of 87788209 is about 444.4388989146.

The spelling of 87788209 in words is "eighty-seven million, seven hundred eighty-eight thousand, two hundred nine".