78404225 has 24 divisors (see below), whose sum is σ = 101243520. Its totient is φ = 60182720.

The previous prime is 78404213. The next prime is 78404231. The reversal of 78404225 is 52240487.

It is not a de Polignac number, because 78404225 - 2¹² = 78400129 is a prime.

It is a super-2 number, since 2×78404225² = 12294444995701250, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78404191 and 78404200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61646 + ... + 62904.

It is an arithmetic number, because the mean of its divisors is an integer number (4218480).

Almost surely, 2^78404225 is an apocalyptic number.

It is an amenable number.

78404225 is a deficient number, since it is larger than the sum of its proper divisors (22839295).

78404225 is a wasteful number, since it uses less digits than its factorization.

78404225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369 (or 1364 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 78404225 is about 8854.6160278128. The cubic root of 78404225 is about 428.0026803483.

The spelling of 78404225 in words is "seventy-eight million, four hundred four thousand, two hundred twenty-five".