78424538 has 8 divisors (see below), whose sum is σ = 118142388. Its totient is φ = 39043744.

The previous prime is 78424537. The next prime is 78424543. The reversal of 78424538 is 83542487.

It can be written as a sum of positive squares in 2 ways, for example, as 73393489 + 5031049 = 8567^2 + 2243^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 78424495 and 78424504.

It is not an unprimeable number, because it can be changed into a prime (78424531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83681 + ... + 84612.

Almost surely, 2^78424538 is an apocalyptic number.

78424538 is a deficient number, since it is larger than the sum of its proper divisors (39717850).

78424538 is a wasteful number, since it uses less digits than its factorization.

78424538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168528.

The product of its digits is 215040, while the sum is 41.

The square root of 78424538 is about 8855.7629823748. The cubic root of 78424538 is about 428.0396395289.

The spelling of 78424538 in words is "seventy-eight million, four hundred twenty-four thousand, five hundred thirty-eight".