7663978 has 16 divisors (see below), whose sum is σ = 13320000. Its totient is φ = 3239136.

The previous prime is 7663969. The next prime is 7663993. The reversal of 7663978 is 8793667.

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 7 ways as a sum of consecutive naturals, for example, 2728 + ... + 4771.

It is an arithmetic number, because the mean of its divisors is an integer number (832500).

Almost surely, 2^7663978 is an apocalyptic number.

7663978 is a deficient number, since it is larger than the sum of its proper divisors (5656022).

7663978 is a wasteful number, since it uses less digits than its factorization.

7663978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7581.

The product of its digits is 381024, while the sum is 46.

The square root of 7663978 is about 2768.3890622526. The cubic root of 7663978 is about 197.1596702537.

The spelling of 7663978 in words is "seven million, six hundred sixty-three thousand, nine hundred seventy-eight".