998560778 has 48 divisors (see below), whose sum is σ = 1653640704. Its totient is φ = 450906720.

The previous prime is 998560753. The next prime is 998560811. The reversal of 998560778 is 877065899.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3149876 + ... + 3150192.

It is an arithmetic number, because the mean of its divisors is an integer number (34450848).

Almost surely, 2^998560778 is an apocalyptic number.

998560778 is a deficient number, since it is larger than the sum of its proper divisors (655079926).

998560778 is a wasteful number, since it uses less digits than its factorization.

998560778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 59.

The square root of 998560778 is about 31600.0123101242. The cubic root of 998560778 is about 999.5200289980.

The spelling of 998560778 in words is "nine hundred ninety-eight million, five hundred sixty thousand, seven hundred seventy-eight".