78969496987 has 4 divisors (see below), whose sum is σ = 81692583120. Its totient is φ = 76246410856.

The previous prime is 78969496981. The next prime is 78969497011.

It is a happy number.

78969496987 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 not a de Polignac number, because 78969496987 - 2³ = 78969496979 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78969496987.

It is not an unprimeable number, because it can be changed into a prime (78969496981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1361543023 + ... + 1361543080.

It is an arithmetic number, because the mean of its divisors is an integer number (20423145780).

Almost surely, 2^78969496987 is an apocalyptic number.

78969496987 is a deficient number, since it is larger than the sum of its proper divisors (2723086133).

78969496987 is a wasteful number, since it uses less digits than its factorization.

78969496987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2723086132.

The product of its digits is 2962842624, while the sum is 82.

The spelling of 78969496987 in words is "seventy-eight billion, nine hundred sixty-nine million, four hundred ninety-six thousand, nine hundred eighty-seven".