78898425992 has 8 divisors (see below), whose sum is σ = 147934548750. Its totient is φ = 39449212992.

The previous prime is 78898425971. The next prime is 78898425997. The reversal of 78898425992 is 29952489887.

It can be written as a sum of positive squares in only one way, i.e., 65809693156 + 13088732836 = 256534^2 + 114406^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (78898425997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4931151617 + ... + 4931151632.

Almost surely, 2^78898425992 is an apocalyptic number.

It is an amenable number.

78898425992 is a deficient number, since it is larger than the sum of its proper divisors (69036122758).

78898425992 is a wasteful number, since it uses less digits than its factorization.

78898425992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9862303255 (or 9862303251 counting only the distinct ones).

The product of its digits is 209018880, while the sum is 71.

The spelling of 78898425992 in words is "seventy-eight billion, eight hundred ninety-eight million, four hundred twenty-five thousand, nine hundred ninety-two".