1978442528 has 24 divisors (see below), whose sum is σ = 3896063388. Its totient is φ = 988966144.

The previous prime is 1978442471. The next prime is 1978442539. The reversal of 1978442528 is 8252448791.

It can be written as a sum of positive squares in 2 ways, for example, as 1406850064 + 571592464 = 37508^2 + 23908^2 .

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, 208250 + ... + 217542.

Almost surely, 2^1978442528 is an apocalyptic number.

It is an amenable number.

1978442528 is a deficient number, since it is larger than the sum of its proper divisors (1917620860).

1978442528 is an equidigital number, since it uses as much as digits as its factorization.

1978442528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15956 (or 15948 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 50.

The square root of 1978442528 is about 44479.6866895440. The cubic root of 1978442528 is about 1255.3779019945.

The spelling of 1978442528 in words is "one billion, nine hundred seventy-eight million, four hundred forty-two thousand, five hundred twenty-eight".