78078424 has 8 divisors (see below), whose sum is σ = 146397060. Its totient is φ = 39039208.

The previous prime is 78078409. The next prime is 78078431. The reversal of 78078424 is 42487087.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4879894 + ... + 4879909.

Almost surely, 2^78078424 is an apocalyptic number.

It is an amenable number.

78078424 is a deficient number, since it is larger than the sum of its proper divisors (68318636).

78078424 is a wasteful number, since it uses less digits than its factorization.

78078424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9759809 (or 9759805 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 40.

The square root of 78078424 is about 8836.1996355900. The cubic root of 78078424 is about 427.4090163523.

The spelling of 78078424 in words is "seventy-eight million, seventy-eight thousand, four hundred twenty-four".