78494649487 has 4 divisors (see below), whose sum is σ = 78503775840. Its totient is φ = 78485523136.

The previous prime is 78494649461. The next prime is 78494649503.

78494649487 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78494649487 is a prime.

It is a super-2 number, since 2×78494649487² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78494649427) 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 in 3 ways as a sum of consecutive naturals, for example, 4550263 + ... + 4567480.

It is an arithmetic number, because the mean of its divisors is an integer number (19625943960).

Almost surely, 2^78494649487 is an apocalyptic number.

78494649487 is a deficient number, since it is larger than the sum of its proper divisors (9126353).

78494649487 is an equidigital number, since it uses as much as digits as its factorization.

78494649487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9126352.

The product of its digits is 390168576, while the sum is 70.

The spelling of 78494649487 in words is "seventy-eight billion, four hundred ninety-four million, six hundred forty-nine thousand, four hundred eighty-seven".