78020225 has 12 divisors (see below), whose sum is σ = 102436524. Its totient is φ = 58744320.

The previous prime is 78020221. The next prime is 78020233. The reversal of 78020225 is 52202087.

It can be written as a sum of positive squares in 6 ways, for example, as 456976 + 77563249 = 676^2 + 8807^2 .

It is not a de Polignac number, because 78020225 - 2² = 78020221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78020194 and 78020203.

It is not an unprimeable number, because it can be changed into a prime (78020221) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 91364 + ... + 92213.

It is an arithmetic number, because the mean of its divisors is an integer number (8536377).

Almost surely, 2^78020225 is an apocalyptic number.

It is an amenable number.

78020225 is a deficient number, since it is larger than the sum of its proper divisors (24416299).

78020225 is a wasteful number, since it uses less digits than its factorization.

78020225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183604 (or 183599 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 78020225 is about 8832.9058072641. The cubic root of 78020225 is about 427.3027942612.

The spelling of 78020225 in words is "seventy-eight million, twenty thousand, two hundred twenty-five".