78494467887 has 24 divisors (see below), whose sum is σ = 123772566528. Its totient is φ = 47539976400.

The previous prime is 78494467853. The next prime is 78494467889. The reversal of 78494467887 is 78876449487.

78494467887 is a `hidden beast` number, since 7 + 84 + 9 + 4 + 467 + 8 + 87 = 666.

It is not a de Polignac number, because 78494467887 - 2⁷ = 78494467759 is a prime.

It is a super-2 number, since 2×78494467887² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78494467889) 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 23 ways as a sum of consecutive naturals, for example, 123873 + ... + 415130.

It is an arithmetic number, because the mean of its divisors is an integer number (5157190272).

Almost surely, 2^78494467887 is an apocalyptic number.

78494467887 is a deficient number, since it is larger than the sum of its proper divisors (45278098641).

78494467887 is a wasteful number, since it uses less digits than its factorization.

78494467887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540491 (or 540488 counting only the distinct ones).

The product of its digits is 606928896, while the sum is 72.

The spelling of 78494467887 in words is "seventy-eight billion, four hundred ninety-four million, four hundred sixty-seven thousand, eight hundred eighty-seven".