78424084 has 6 divisors (see below), whose sum is σ = 137242154. Its totient is φ = 39212040.

The previous prime is 78424081. The next prime is 78424121. The reversal of 78424084 is 48042487.

It can be written as a sum of positive squares in only one way, i.e., 69555600 + 8868484 = 8340^2 + 2978^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78424081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9803007 + ... + 9803014.

Almost surely, 2^78424084 is an apocalyptic number.

It is an amenable number.

78424084 is a deficient number, since it is larger than the sum of its proper divisors (58818070).

78424084 is a wasteful number, since it uses less digits than its factorization.

78424084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19606025 (or 19606023 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 37.

The square root of 78424084 is about 8855.7373493120. The cubic root of 78424084 is about 428.0388135529.

The spelling of 78424084 in words is "seventy-eight million, four hundred twenty-four thousand, eighty-four".