1205568978 has 8 divisors (see below), whose sum is σ = 2411137968. Its totient is φ = 401856324.

The previous prime is 1205568977. The next prime is 1205568979. The reversal of 1205568978 is 8798655021.

It is an interprime number because it is at equal distance from previous prime (1205568977) and next prime (1205568979).

It is a sphenic number, since it is the product of 3 distinct primes.

1205568978 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1205568978.

It is not an unprimeable number, because it can be changed into a prime (1205568977) 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 3 ways as a sum of consecutive naturals, for example, 100464076 + ... + 100464087.

It is an arithmetic number, because the mean of its divisors is an integer number (301392246).

Almost surely, 2^1205568978 is an apocalyptic number.

1205568978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1205568978 is a wasteful number, since it uses less digits than its factorization.

1205568978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200928168.

The product of its (nonzero) digits is 1209600, while the sum is 51.

The square root of 1205568978 is about 34721.3043821801. The cubic root of 1205568978 is about 1064.2999000333.

The spelling of 1205568978 in words is "one billion, two hundred five million, five hundred sixty-eight thousand, nine hundred seventy-eight".