78425 has 6 divisors (see below), whose sum is σ = 97278. Its totient is φ = 62720.

The previous prime is 78401. The next prime is 78427. The reversal of 78425 is 52487.

It can be written as a sum of positive squares in 3 ways, for example, as 26896 + 51529 = 164^2 + 227^2 .

It is not a de Polignac number, because 78425 - 2¹⁶ = 12889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78394 and 78403.

It is not an unprimeable number, because it can be changed into a prime (78427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1544 + ... + 1593.

It is an arithmetic number, because the mean of its divisors is an integer number (16213).

2⁷⁸⁴²⁵ is an apocalyptic number.

It is an amenable number.

78425 is a deficient number, since it is larger than the sum of its proper divisors (18853).

78425 is a wasteful number, since it uses less digits than its factorization.

78425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3147 (or 3142 counting only the distinct ones).

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

The square root of 78425 is about 280.0446392988. The cubic root of 78425 is about 42.8040480056.

It can be divided in two parts, 784 and 25, that multiplied together give a square (19600 = 140²).

The spelling of 78425 in words is "seventy-eight thousand, four hundred twenty-five".