1987780677 has 8 divisors (see below), whose sum is σ = 2652017760. Its totient is φ = 1324365360.

The previous prime is 1987780657. The next prime is 1987780679. The reversal of 1987780677 is 7760877891.

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

It is not a de Polignac number, because 1987780677 - 2¹⁴ = 1987764293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1987780677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987780679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199774 + ... + 209487.

It is an arithmetic number, because the mean of its divisors is an integer number (331502220).

Almost surely, 2^1987780677 is an apocalyptic number.

It is an amenable number.

1987780677 is a deficient number, since it is larger than the sum of its proper divisors (664237083).

1987780677 is a wasteful number, since it uses less digits than its factorization.

1987780677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410883.

The product of its (nonzero) digits is 8297856, while the sum is 60.

The square root of 1987780677 is about 44584.5340561052. The cubic root of 1987780677 is about 1257.3499094540.

The spelling of 1987780677 in words is "one billion, nine hundred eighty-seven million, seven hundred eighty thousand, six hundred seventy-seven".