78979497987 has 16 divisors (see below), whose sum is σ = 113943941888. Its totient is φ = 48372418080.

The previous prime is 78979497941. The next prime is 78979498001.

78979497987 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78979497987 - 2⁷ = 78979497859 is a prime.

It is a super-2 number, since 2×78979497987² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78979497917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4790623 + ... + 4807080.

It is an arithmetic number, because the mean of its divisors is an integer number (7121496368).

Almost surely, 2^78979497987 is an apocalyptic number.

78979497987 is a deficient number, since it is larger than the sum of its proper divisors (34964443901).

78979497987 is a wasteful number, since it uses less digits than its factorization.

78979497987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9597930.

The product of its digits is 4032758016, while the sum is 84.

The spelling of 78979497987 in words is "seventy-eight billion, nine hundred seventy-nine million, four hundred ninety-seven thousand, nine hundred eighty-seven".