78424511 has 16 divisors (see below), whose sum is σ = 87696000. Its totient is φ = 69530400.

The previous prime is 78424501. The next prime is 78424531. The reversal of 78424511 is 11542487.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78424511 - 2⁶ = 78424447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78424501) 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, 96296 + ... + 97106.

It is an arithmetic number, because the mean of its divisors is an integer number (5481000).

Almost surely, 2^78424511 is an apocalyptic number.

78424511 is a deficient number, since it is larger than the sum of its proper divisors (9271489).

78424511 is a wasteful number, since it uses less digits than its factorization.

78424511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030.

The product of its digits is 8960, while the sum is 32.

The square root of 78424511 is about 8855.7614579436. The cubic root of 78424511 is about 428.0395904071.

Adding to 78424511 its reverse (11542487), we get a palindrome (89966998).

The spelling of 78424511 in words is "seventy-eight million, four hundred twenty-four thousand, five hundred eleven".