1987605766 has 8 divisors (see below), whose sum is σ = 3111035184. Its totient is φ = 950594040.

The previous prime is 1987605733. The next prime is 1987605787. The reversal of 1987605766 is 6675067891.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21604365 + ... + 21604456.

It is an arithmetic number, because the mean of its divisors is an integer number (388879398).

Almost surely, 2^1987605766 is an apocalyptic number.

1987605766 is a deficient number, since it is larger than the sum of its proper divisors (1123429418).

1987605766 is a wasteful number, since it uses less digits than its factorization.

1987605766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43208846.

The product of its (nonzero) digits is 3810240, while the sum is 55.

The square root of 1987605766 is about 44582.5724470897. The cubic root of 1987605766 is about 1257.3130289967.

It can be divided in two parts, 1987 and 605766, that added together give a triangular number (607753 = T₁₁₀₂).

The spelling of 1987605766 in words is "one billion, nine hundred eighty-seven million, six hundred five thousand, seven hundred sixty-six".