988687949786890 has 24 divisors (see below), whose sum is σ = 1860378043900068. Its totient is φ = 378280606872960.

The previous prime is 988687949786863. The next prime is 988687949786903. The reversal of 988687949786890 is 98687949786889.

It can be written as a sum of positive squares in 2 ways, for example, as 971009229762441 + 17678720024449 = 31161021^2 + 4204607^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93448761231 + ... + 93448771810.

Almost surely, 2^{988687949786890} is an apocalyptic number.

988687949786890 is a deficient number, since it is larger than the sum of its proper divisors (871690094113178).

988687949786890 is a wasteful number, since it uses less digits than its factorization.

988687949786890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186897533094 (or 186897533071 counting only the distinct ones).

The product of its (nonzero) digits is 1516975423488, while the sum is 106.

The spelling of 988687949786890 in words is "nine hundred eighty-eight trillion, six hundred eighty-seven billion, nine hundred forty-nine million, seven hundred eighty-six thousand, eight hundred ninety".