87781853909 has 8 divisors (see below), whose sum is σ = 90018157152. Its totient is φ = 85554408240.

The previous prime is 87781853897. The next prime is 87781853921. The reversal of 87781853909 is 90935818778.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (87781853897) and next prime (87781853921).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87781853909 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 (87781853969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2194319 + ... + 2233964.

It is an arithmetic number, because the mean of its divisors is an integer number (11252269644).

Almost surely, 2^87781853909 is an apocalyptic number.

It is an amenable number.

87781853909 is a deficient number, since it is larger than the sum of its proper divisors (2236303243).

87781853909 is a wasteful number, since it uses less digits than its factorization.

87781853909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4428787.

The product of its (nonzero) digits is 30481920, while the sum is 65.

The spelling of 87781853909 in words is "eighty-seven billion, seven hundred eighty-one million, eight hundred fifty-three thousand, nine hundred nine".