87771909 has 8 divisors (see below), whose sum is σ = 117094432. Its totient is φ = 58482000.

The previous prime is 87771899. The next prime is 87771913. The reversal of 87771909 is 90917778.

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

It is not a de Polignac number, because 87771909 - 2⁷ = 87771781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87771109) 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, 967 + ... + 13284.

It is an arithmetic number, because the mean of its divisors is an integer number (14636804).

Almost surely, 2^87771909 is an apocalyptic number.

It is an amenable number.

87771909 is a deficient number, since it is larger than the sum of its proper divisors (29322523).

87771909 is a wasteful number, since it uses less digits than its factorization.

87771909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16307.

The product of its (nonzero) digits is 222264, while the sum is 48.

The square root of 87771909 is about 9368.6663405204. Note that the first 3 decimals coincide. The cubic root of 87771909 is about 444.4113902756.

The spelling of 87771909 in words is "eighty-seven million, seven hundred seventy-one thousand, nine hundred nine".