87785986369 has 3 divisors (see below), whose sum is σ = 87786282657. Its totient is φ = 87785690082.

The previous prime is 87785986303. The next prime is 87785986441. The reversal of 87785986369 is 96368958778.

The square root of 87785986369 is 296287.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 87785986369 - 2¹⁵ = 87785953601 is a prime.

It is a super-2 number, since 2×87785986369² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87785986295 and 87785986304.

It is not an unprimeable number, because it can be changed into a prime (87785956369) 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 2 ways as a sum of consecutive naturals, for example, 148144 + ... + 444430.

It is an arithmetic number, because the mean of its divisors is an integer number (29262094219).

Almost surely, 2^87785986369 is an apocalyptic number.

87785986369 is the 296287-th square number.

87785986369 is the 148144-th centered octagonal number.

It is an amenable number.

87785986369 is a deficient number, since it is larger than the sum of its proper divisors (296288).

87785986369 is an frugal number, since it uses more digits than its factorization.

87785986369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592574 (or 296287 counting only the distinct ones).

The product of its digits is 1097349120, while the sum is 76.

The spelling of 87785986369 in words is "eighty-seven billion, seven hundred eighty-five million, nine hundred eighty-six thousand, three hundred sixty-nine".