978554678 has 4 divisors (see below), whose sum is σ = 1467832020. Its totient is φ = 489277338.

The previous prime is 978554639. The next prime is 978554723. The reversal of 978554678 is 876455879.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 244638668 + ... + 244638671.

It is an arithmetic number, because the mean of its divisors is an integer number (366958005).

Almost surely, 2^978554678 is an apocalyptic number.

978554678 is a deficient number, since it is larger than the sum of its proper divisors (489277342).

978554678 is a wasteful number, since it uses less digits than its factorization.

978554678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489277341.

The product of its digits is 16934400, while the sum is 59.

The square root of 978554678 is about 31281.8586084651. The cubic root of 978554678 is about 992.7998414748.

The spelling of 978554678 in words is "nine hundred seventy-eight million, five hundred fifty-four thousand, six hundred seventy-eight".