998770378 has 48 divisors (see below), whose sum is σ = 1649229120. Its totient is φ = 452283264.

The previous prime is 998770363. The next prime is 998770391. The reversal of 998770378 is 873077899.

It is a happy number.

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, 3797475 + ... + 3797737.

It is an arithmetic number, because the mean of its divisors is an integer number (34358940).

Almost surely, 2^998770378 is an apocalyptic number.

998770378 is the 19988-th heptagonal number.

998770378 is a deficient number, since it is larger than the sum of its proper divisors (650458742).

998770378 is a wasteful number, since it uses less digits than its factorization.

998770378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 394 counting only the distinct ones).

The product of its (nonzero) digits is 5334336, while the sum is 58.

The square root of 998770378 is about 31603.3285905140. The cubic root of 998770378 is about 999.5899578884.

The spelling of 998770378 in words is "nine hundred ninety-eight million, seven hundred seventy thousand, three hundred seventy-eight".