78765432 has 64 divisors (see below), whose sum is σ = 206599680. Its totient is φ = 24976512.

The previous prime is 78765419. The next prime is 78765433. The reversal of 78765432 is 23456787.

78765432 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78765433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161493 + ... + 161979.

It is an arithmetic number, because the mean of its divisors is an integer number (3228120).

Almost surely, 2^78765432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78765432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103299840).

78765432 is an abundant number, since it is smaller than the sum of its proper divisors (127834248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78765432 is a wasteful number, since it uses less digits than its factorization.

78765432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812 (or 808 counting only the distinct ones).

The product of its digits is 282240, while the sum is 42.

The square root of 78765432 is about 8874.9891267539. The cubic root of 78765432 is about 428.6589407324.

It can be divided in two parts, 78765 and 432, that added together give a palindrome (79197).

The spelling of 78765432 in words is "seventy-eight million, seven hundred sixty-five thousand, four hundred thirty-two".