78997479987 has 8 divisors (see below), whose sum is σ = 105484192704. Its totient is φ = 52587876968.

The previous prime is 78997479983. The next prime is 78997479991.

78997479987 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (78997479983) and next prime (78997479991).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78997479987 - 2² = 78997479983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78997479983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19275033 + ... + 19279130.

It is an arithmetic number, because the mean of its divisors is an integer number (13185524088).

Almost surely, 2^78997479987 is an apocalyptic number.

78997479987 is a deficient number, since it is larger than the sum of its proper divisors (26486712717).

78997479987 is a wasteful number, since it uses less digits than its factorization.

78997479987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38554849.

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

The spelling of 78997479987 in words is "seventy-eight billion, nine hundred ninety-seven million, four hundred seventy-nine thousand, nine hundred eighty-seven".