78424005 has 16 divisors (see below), whose sum is σ = 136885824. Its totient is φ = 38023680.

The previous prime is 78423953. The next prime is 78424007. The reversal of 78424005 is 50042487.

It is not a de Polignac number, because 78424005 - 2⁸ = 78423749 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78424007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237484 + ... + 237813.

It is an arithmetic number, because the mean of its divisors is an integer number (8555364).

Almost surely, 2^78424005 is an apocalyptic number.

It is an amenable number.

78424005 is a deficient number, since it is larger than the sum of its proper divisors (58461819).

78424005 is a wasteful number, since it uses less digits than its factorization.

78424005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475316.

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 78424005 is about 8855.7328889257. The cubic root of 78424005 is about 428.0386698254.

The spelling of 78424005 in words is "seventy-eight million, four hundred twenty-four thousand, five".