645378 has 8 divisors (see below), whose sum is σ = 1290768. Its totient is φ = 215124.

The previous prime is 645367. The next prime is 645383. The reversal of 645378 is 873546.

It is a sphenic number, since it is the product of 3 distinct primes.

645378 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53776 + ... + 53787.

It is an arithmetic number, because the mean of its divisors is an integer number (161346).

2⁶⁴⁵³⁷⁸ is an apocalyptic number.

645378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645378 is a wasteful number, since it uses less digits than its factorization.

645378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107568.

The product of its digits is 20160, while the sum is 33.

The square root of 645378 is about 803.3542182624. The cubic root of 645378 is about 86.4181010600.

The spelling of 645378 in words is "six hundred forty-five thousand, three hundred seventy-eight".