78954445987 has 4 divisors (see below), whose sum is σ = 81677013120. Its totient is φ = 76231878856.

The previous prime is 78954445981. The next prime is 78954446027.

78954445987 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 a de Polignac number, because none of the positive numbers 2^k-78954445987 is a prime.

It is a super-2 number, since 2×78954445987² (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 (78954445981) 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, 1361283523 + ... + 1361283580.

It is an arithmetic number, because the mean of its divisors is an integer number (20419253280).

Almost surely, 2^78954445987 is an apocalyptic number.

78954445987 is a deficient number, since it is larger than the sum of its proper divisors (2722567133).

78954445987 is a wasteful number, since it uses less digits than its factorization.

78954445987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2722567132.

The product of its digits is 406425600, while the sum is 70.

The spelling of 78954445987 in words is "seventy-eight billion, nine hundred fifty-four million, four hundred forty-five thousand, nine hundred eighty-seven".