1987790718 has 16 divisors (see below), whose sum is σ = 3977614080. Its totient is φ = 662258136.

The previous prime is 1987790687. The next prime is 1987790719. The reversal of 1987790718 is 8170977891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987790719) 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, 71830 + ... + 95577.

It is an arithmetic number, because the mean of its divisors is an integer number (248600880).

Almost surely, 2^1987790718 is an apocalyptic number.

1987790718 is an abundant number, since it is smaller than the sum of its proper divisors (1989823362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1987790718 is a wasteful number, since it uses less digits than its factorization.

1987790718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169391.

The product of its (nonzero) digits is 1778112, while the sum is 57.

The square root of 1987790718 is about 44584.6466622760. The cubic root of 1987790718 is about 1257.3520265603.

The spelling of 1987790718 in words is "one billion, nine hundred eighty-seven million, seven hundred ninety thousand, seven hundred eighteen".