1978088554 has 12 divisors (see below), whose sum is σ = 3212931366. Its totient is φ = 912963792.

The previous prime is 1978088551. The next prime is 1978088557. The reversal of 1978088554 is 4558808791.

It is an interprime number because it is at equal distance from previous prime (1978088551) and next prime (1978088557).

It can be written as a sum of positive squares in 3 ways, for example, as 1100447929 + 877640625 = 33173^2 + 29625^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1978088495 and 1978088504.

It is not an unprimeable number, because it can be changed into a prime (1978088551) 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 5 ways as a sum of consecutive naturals, for example, 2925829 + ... + 2926504.

Almost surely, 2^1978088554 is an apocalyptic number.

1978088554 is a deficient number, since it is larger than the sum of its proper divisors (1234842812).

1978088554 is a wasteful number, since it uses less digits than its factorization.

1978088554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5852361 (or 5852348 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 55.

The square root of 1978088554 is about 44475.7074592412. The cubic root of 1978088554 is about 1255.3030286812.

The spelling of 1978088554 in words is "one billion, nine hundred seventy-eight million, eighty-eight thousand, five hundred fifty-four".