78989298987 has 16 divisors (see below), whose sum is σ = 106931914880. Its totient is φ = 51853709952.

The previous prime is 78989298977. The next prime is 78989299007.

78989298987 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78989298987 - 2¹⁸ = 78989036843 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78989298917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 460563 + ... + 608355.

It is an arithmetic number, because the mean of its divisors is an integer number (6683244680).

Almost surely, 2^78989298987 is an apocalyptic number.

78989298987 is a deficient number, since it is larger than the sum of its proper divisors (27942615893).

78989298987 is a wasteful number, since it uses less digits than its factorization.

78989298987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150522.

The product of its digits is 2633637888, while the sum is 84.

The spelling of 78989298987 in words is "seventy-eight billion, nine hundred eighty-nine million, two hundred ninety-eight thousand, nine hundred eighty-seven".