1017664978 has 32 divisors (see below), whose sum is σ = 1700377920. Its totient is φ = 452861760.

The previous prime is 1017664919. The next prime is 1017664979. The reversal of 1017664978 is 8794667101.

1017664978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1017664979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 917088 + ... + 918196.

It is an arithmetic number, because the mean of its divisors is an integer number (53136810).

Almost surely, 2^1017664978 is an apocalyptic number.

1017664978 is a deficient number, since it is larger than the sum of its proper divisors (682712942).

1017664978 is a wasteful number, since it uses less digits than its factorization.

1017664978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1962.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 1017664978 is about 31900.8617124992. The cubic root of 1017664978 is about 1005.8539899314.

The spelling of 1017664978 in words is "one billion, seventeen million, six hundred sixty-four thousand, nine hundred seventy-eight".