798639978 has 32 divisors (see below), whose sum is σ = 1606832640. Its totient is φ = 264627440.

The previous prime is 798639967. The next prime is 798639979. The reversal of 798639978 is 879936897.

It is not an unprimeable number, because it can be changed into a prime (798639979) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 1234051 + ... + 1234697.

It is an arithmetic number, because the mean of its divisors is an integer number (50213520).

Almost surely, 2^798639978 is an apocalyptic number.

798639978 is an abundant number, since it is smaller than the sum of its proper divisors (808192662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

798639978 is a wasteful number, since it uses less digits than its factorization.

798639978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562.

The product of its digits is 41150592, while the sum is 66.

The square root of 798639978 is about 28260.2190012746. The cubic root of 798639978 is about 927.7914130938.

The spelling of 798639978 in words is "seven hundred ninety-eight million, six hundred thirty-nine thousand, nine hundred seventy-eight".