978128978 has 8 divisors (see below), whose sum is σ = 1467348480. Its totient is φ = 489012820.

The previous prime is 978128959. The next prime is 978128993. The reversal of 978128978 is 879821879.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5363 + ... + 44553.

It is an arithmetic number, because the mean of its divisors is an integer number (183418560).

Almost surely, 2^978128978 is an apocalyptic number.

978128978 is a deficient number, since it is larger than the sum of its proper divisors (489219502).

978128978 is a wasteful number, since it uses less digits than its factorization.

978128978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51672.

The product of its digits is 4064256, while the sum is 59.

The square root of 978128978 is about 31275.0536050700. The cubic root of 978128978 is about 992.6558549052.

The spelling of 978128978 in words is "nine hundred seventy-eight million, one hundred twenty-eight thousand, nine hundred seventy-eight".