78434740 has 24 divisors (see below), whose sum is σ = 165672360. Its totient is φ = 31191168.

The previous prime is 78434737. The next prime is 78434747. The reversal of 78434740 is 4743487.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 45670564 + 32764176 = 6758^2 + 5724^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78434740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78434747) 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 7 ways as a sum of consecutive naturals, for example, 7875 + ... + 14794.

It is an arithmetic number, because the mean of its divisors is an integer number (6903015).

Almost surely, 2^78434740 is an apocalyptic number.

It is an amenable number.

78434740 is an abundant number, since it is smaller than the sum of its proper divisors (87237620).

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

78434740 is a wasteful number, since it uses less digits than its factorization.

78434740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22851 (or 22849 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 37.

The square root of 78434740 is about 8856.3389727359. The cubic root of 78434740 is about 428.0581994982.

The spelling of 78434740 in words is "seventy-eight million, four hundred thirty-four thousand, seven hundred forty".