1978678250 has 16 divisors (see below), whose sum is σ = 3704086152. Its totient is φ = 791471200.

The previous prime is 1978678231. The next prime is 1978678253. The reversal of 1978678250 is 528768791.

It can be written as a sum of positive squares in 4 ways, for example, as 225330121 + 1753348129 = 15011^2 + 41873^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1978678192 and 1978678201.

It is not an unprimeable number, because it can be changed into a prime (1978678253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3957107 + ... + 3957606.

Almost surely, 2^1978678250 is an apocalyptic number.

1978678250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1978678250 is a deficient number, since it is larger than the sum of its proper divisors (1725407902).

1978678250 is an equidigital number, since it uses as much as digits as its factorization.

1978678250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7914730 (or 7914720 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 53.

The square root of 1978678250 is about 44482.3363819843. The cubic root of 1978678250 is about 1255.4277574463.

The spelling of 1978678250 in words is "one billion, nine hundred seventy-eight million, six hundred seventy-eight thousand, two hundred fifty".