78223325 has 6 divisors (see below), whose sum is σ = 96996954. Its totient is φ = 62578640.

The previous prime is 78223309. The next prime is 78223331. The reversal of 78223325 is 52332287.

It can be written as a sum of positive squares in 3 ways, for example, as 395641 + 77827684 = 629^2 + 8822^2 .

It is not a de Polignac number, because 78223325 - 2⁴ = 78223309 is a prime.

It is a super-2 number, since 2×78223325² = 12237777148111250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78223291 and 78223300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1564442 + ... + 1564491.

It is an arithmetic number, because the mean of its divisors is an integer number (16166159).

Almost surely, 2^78223325 is an apocalyptic number.

It is an amenable number.

78223325 is a deficient number, since it is larger than the sum of its proper divisors (18773629).

78223325 is a wasteful number, since it uses less digits than its factorization.

78223325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128943 (or 3128938 counting only the distinct ones).

The product of its digits is 20160, while the sum is 32.

The square root of 78223325 is about 8844.3951178133. The cubic root of 78223325 is about 427.6732537614.

The spelling of 78223325 in words is "seventy-eight million, two hundred twenty-three thousand, three hundred twenty-five".