78432438 has 64 divisors (see below), whose sum is σ = 191001600. Its totient is φ = 21422016.

The previous prime is 78432433. The next prime is 78432463. The reversal of 78432438 is 83423487.

It is a junction number, because it is equal to n+sod(n) for n = 78432396 and 78432405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78432433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46506 + ... + 48162.

It is an arithmetic number, because the mean of its divisors is an integer number (2984400).

Almost surely, 2^78432438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78432438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95500800).

78432438 is an abundant number, since it is smaller than the sum of its proper divisors (112569162).

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

78432438 is a wasteful number, since it uses less digits than its factorization.

78432438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706 (or 1692 counting only the distinct ones).

The product of its digits is 129024, while the sum is 39.

The square root of 78432438 is about 8856.2090083737. The cubic root of 78432438 is about 428.0540117297.

The spelling of 78432438 in words is "seventy-eight million, four hundred thirty-two thousand, four hundred thirty-eight".