78454789 has 12 divisors (see below), whose sum is σ = 91223904. Its totient is φ = 66081312.

The previous prime is 78454777. The next prime is 78454793. The reversal of 78454789 is 98745487.

It is not a de Polignac number, because 78454789 - 2⁵ = 78454757 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 (78454709) 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, 191617 + ... + 192025.

It is an arithmetic number, because the mean of its divisors is an integer number (7601992).

Almost surely, 2^78454789 is an apocalyptic number.

It is an amenable number.

78454789 is a deficient number, since it is larger than the sum of its proper divisors (12769115).

78454789 is an frugal number, since it uses more digits than its factorization.

78454789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892 (or 483 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 52.

The square root of 78454789 is about 8857.4708015325. The cubic root of 78454789 is about 428.0946689152.

It can be divided in two parts, 7845478 and 9, that added together give a palindrome (7845487).

The spelling of 78454789 in words is "seventy-eight million, four hundred fifty-four thousand, seven hundred eighty-nine".