78494649488 has 10 divisors (see below), whose sum is σ = 152083383414. Its totient is φ = 39247324736.

The previous prime is 78494649461. The next prime is 78494649503. The reversal of 78494649488 is 88494649487.

It can be written as a sum of positive squares in only one way, i.e., 65519617024 + 12975032464 = 255968^2 + 113908^2 .

It is a super-3 number, since 3×78494649488³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2452957781 + ... + 2452957812.

Almost surely, 2^78494649488 is an apocalyptic number.

It is an amenable number.

78494649488 is a deficient number, since it is larger than the sum of its proper divisors (73588733926).

78494649488 is a wasteful number, since it uses less digits than its factorization.

78494649488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4905915601 (or 4905915595 counting only the distinct ones).

The product of its digits is 445906944, while the sum is 71.

Subtracting 78494649488 from its reverse (88494649487), we obtain a palindrome (9999999999).

The spelling of 78494649488 in words is "seventy-eight billion, four hundred ninety-four million, six hundred forty-nine thousand, four hundred eighty-eight".