78894449887 has 12 divisors (see below), whose sum is σ = 86914505160. Its totient is φ = 71560277360.

The previous prime is 78894449863. The next prime is 78894449929.

78894449887 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78894449887 - 2¹⁹ = 78893925599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78894449087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 682312 + ... + 789517.

It is an arithmetic number, because the mean of its divisors is an integer number (7242875430).

Almost surely, 2^78894449887 is an apocalyptic number.

78894449887 is a deficient number, since it is larger than the sum of its proper divisors (8020055273).

78894449887 is a wasteful number, since it uses less digits than its factorization.

78894449887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472294 (or 1472283 counting only the distinct ones).

The product of its digits is 1040449536, while the sum is 76.

The spelling of 78894449887 in words is "seventy-eight billion, eight hundred ninety-four million, four hundred forty-nine thousand, eight hundred eighty-seven".