78424042487 has 12 divisors (see below), whose sum is σ = 91336749840. Its totient is φ = 67140452736.

The previous prime is 78424042441. The next prime is 78424042531.

78424042487 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78424042487 - 2¹⁴ = 78424026103 is a prime.

It is a super-2 number, since 2×78424042487² (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 (78424042427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 912698 + ... + 994919.

It is an arithmetic number, because the mean of its divisors is an integer number (7611395820).

Almost surely, 2^78424042487 is an apocalyptic number.

78424042487 is a deficient number, since it is larger than the sum of its proper divisors (12912707353).

78424042487 is a wasteful number, since it uses less digits than its factorization.

78424042487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908470 (or 1908463 counting only the distinct ones).

The product of its (nonzero) digits is 3211264, while the sum is 50.

The spelling of 78424042487 in words is "seventy-eight billion, four hundred twenty-four million, forty-two thousand, four hundred eighty-seven".