1987906655 has 8 divisors (see below), whose sum is σ = 2726272032. Its totient is φ = 1363135968.

The previous prime is 1987906649. The next prime is 1987906667. The reversal of 1987906655 is 5566097891.

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

It is a cyclic number.

It is not a de Polignac number, because 1987906655 - 2¹⁰ = 1987905631 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1987906655.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28398632 + ... + 28398701.

It is an arithmetic number, because the mean of its divisors is an integer number (340784004).

Almost surely, 2^1987906655 is an apocalyptic number.

1987906655 is a deficient number, since it is larger than the sum of its proper divisors (738365377).

1987906655 is an equidigital number, since it uses as much as digits as its factorization.

1987906655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56797345.

The product of its (nonzero) digits is 4082400, while the sum is 56.

The square root of 1987906655 is about 44585.9468330549. The cubic root of 1987906655 is about 1257.3764709157.

The spelling of 1987906655 in words is "one billion, nine hundred eighty-seven million, nine hundred six thousand, six hundred fifty-five".