978428650 has 12 divisors (see below), whose sum is σ = 1819877382. Its totient is φ = 391371440.

The previous prime is 978428611. The next prime is 978428663. The reversal of 978428650 is 56824879.

978428650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 922762129 + 55666521 = 30377^2 + 7461^2 .

It is a junction number, because it is equal to n+sod(n) for n = 978428594 and 978428603.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9784237 + ... + 9784336.

Almost surely, 2^978428650 is an apocalyptic number.

978428650 is a deficient number, since it is larger than the sum of its proper divisors (841448732).

978428650 is a wasteful number, since it uses less digits than its factorization.

978428650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19568585 (or 19568580 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 49.

The square root of 978428650 is about 31279.8441492281. The cubic root of 978428650 is about 992.7572187670.

The spelling of 978428650 in words is "nine hundred seventy-eight million, four hundred twenty-eight thousand, six hundred fifty".