1987800065 has 8 divisors (see below), whose sum is σ = 2385746880. Its totient is φ = 1589982192.

The previous prime is 1987800049. The next prime is 1987800077. The reversal of 1987800065 is 5600087891.

It is a happy number.

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 1987800065 - 2⁴ = 1987800049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1987799989 and 1987800025.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5756 + ... + 63314.

It is an arithmetic number, because the mean of its divisors is an integer number (298218360).

Almost surely, 2^1987800065 is an apocalyptic number.

It is an amenable number.

1987800065 is a deficient number, since it is larger than the sum of its proper divisors (397946815).

1987800065 is an equidigital number, since it uses as much as digits as its factorization.

1987800065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64471.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 1987800065 is about 44584.7514852332. The cubic root of 1987800065 is about 1257.3539973330.

The spelling of 1987800065 in words is "one billion, nine hundred eighty-seven million, eight hundred thousand, sixty-five".