87219909 has 40 divisors (see below), whose sum is σ = 149846400. Its totient is φ = 49525344.

The previous prime is 87219901. The next prime is 87219929. The reversal of 87219909 is 90991278.

It is not a de Polignac number, because 87219909 - 2³ = 87219901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87219901) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 112447 + ... + 113219.

It is an arithmetic number, because the mean of its divisors is an integer number (3746160).

Almost surely, 2^87219909 is an apocalyptic number.

It is an amenable number.

87219909 is a deficient number, since it is larger than the sum of its proper divisors (62626491).

87219909 is a wasteful number, since it uses less digits than its factorization.

87219909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991 (or 982 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 87219909 is about 9339.1599729312. The cubic root of 87219909 is about 443.4777918191.

The spelling of 87219909 in words is "eighty-seven million, two hundred nineteen thousand, nine hundred nine".