978784756 has 12 divisors (see below), whose sum is σ = 1728032292. Its totient is φ = 485061248.

The previous prime is 978784727. The next prime is 978784783. The reversal of 978784756 is 657487879.

It can be written as a sum of positive squares in 2 ways, for example, as 19891600 + 958893156 = 4460^2 + 30966^2 .

It is a junction number, because it is equal to n+sod(n) for n = 978784694 and 978784703.

It is a congruent number.

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, 1082275 + ... + 1083178.

It is an arithmetic number, because the mean of its divisors is an integer number (144002691).

Almost surely, 2^978784756 is an apocalyptic number.

It is an amenable number.

978784756 is a deficient number, since it is larger than the sum of its proper divisors (749247536).

978784756 is a wasteful number, since it uses less digits than its factorization.

978784756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165570 (or 2165568 counting only the distinct ones).

The product of its digits is 23708160, while the sum is 61.

The square root of 978784756 is about 31285.5358912070. The cubic root of 978784756 is about 992.8776444861.

The spelling of 978784756 in words is "nine hundred seventy-eight million, seven hundred eighty-four thousand, seven hundred fifty-six".