1978353056 has 12 divisors (see below), whose sum is σ = 3894882642. Its totient is φ = 989176512.

The previous prime is 1978353043. The next prime is 1978353077. The reversal of 1978353056 is 6503538791.

It can be written as a sum of positive squares in only one way, i.e., 1973136400 + 5216656 = 44420^2 + 2284^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1978353056.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30911735 + ... + 30911798.

Almost surely, 2^1978353056 is an apocalyptic number.

1978353056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1978353056 is a deficient number, since it is larger than the sum of its proper divisors (1916529586).

1978353056 is an equidigital number, since it uses as much as digits as its factorization.

1978353056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61823543 (or 61823535 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 47.

The square root of 1978353056 is about 44478.6809156926. The cubic root of 1978353056 is about 1255.3589775353.

The spelling of 1978353056 in words is "one billion, nine hundred seventy-eight million, three hundred fifty-three thousand, fifty-six".