1987604698 has 4 divisors (see below), whose sum is σ = 2981407050. Its totient is φ = 993802348.

The previous prime is 1987604681. The next prime is 1987604701. The reversal of 1987604698 is 8964067891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8964067891 = 383 ⋅23404877.

It can be written as a sum of positive squares in only one way, i.e., 1676329249 + 311275449 = 40943^2 + 17643^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496901173 + ... + 496901176.

Almost surely, 2^1987604698 is an apocalyptic number.

1987604698 is a deficient number, since it is larger than the sum of its proper divisors (993802352).

1987604698 is an equidigital number, since it uses as much as digits as its factorization.

1987604698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993802351.

The product of its (nonzero) digits is 5225472, while the sum is 58.

The square root of 1987604698 is about 44582.5604693136. The cubic root of 1987604698 is about 1257.3128037994.

The spelling of 1987604698 in words is "one billion, nine hundred eighty-seven million, six hundred four thousand, six hundred ninety-eight".