645425 has 12 divisors (see below), whose sum is σ = 873456. Its totient is φ = 469200.

The previous prime is 645419. The next prime is 645431. The reversal of 645425 is 524546.

645425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (645419) and next prime (645431).

It is not a de Polignac number, because 645425 - 2⁴ = 645409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645394 and 645403.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645425.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 899 + ... + 1448.

It is an arithmetic number, because the mean of its divisors is an integer number (72788).

2⁶⁴⁵⁴²⁵ is an apocalyptic number.

It is an amenable number.

645425 is a deficient number, since it is larger than the sum of its proper divisors (228031).

645425 is a wasteful number, since it uses less digits than its factorization.

645425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2368 (or 2363 counting only the distinct ones).

The product of its digits is 4800, while the sum is 26.

The square root of 645425 is about 803.3834700814. The cubic root of 645425 is about 86.4201988240.

The spelling of 645425 in words is "six hundred forty-five thousand, four hundred twenty-five".