1987664597 has 8 divisors (see below), whose sum is σ = 1994361600. Its totient is φ = 1980980064.

The previous prime is 1987664587. The next prime is 1987664617. The reversal of 1987664597 is 7954667891.

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 1987664597 - 2⁶ = 1987664533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987664507) by changing a digit.

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, 397529 + ... + 402497.

It is an arithmetic number, because the mean of its divisors is an integer number (249295200).

Almost surely, 2^1987664597 is an apocalyptic number.

It is an amenable number.

1987664597 is a deficient number, since it is larger than the sum of its proper divisors (6697003).

1987664597 is an equidigital number, since it uses as much as digits as its factorization.

1987664597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6235.

The product of its digits is 22861440, while the sum is 62.

The square root of 1987664597 is about 44583.2322403838. The cubic root of 1987664597 is about 1257.3254339136.

The spelling of 1987664597 in words is "one billion, nine hundred eighty-seven million, six hundred sixty-four thousand, five hundred ninety-seven".