645107 has 6 divisors (see below), whose sum is σ = 681228. Its totient is φ = 610812.

The previous prime is 645097. The next prime is 645131. The reversal of 645107 is 701546.

It is not a de Polignac number, because 645107 - 2⁴ = 645091 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645107.

It is not an unprimeable number, because it can be changed into a prime (645137) 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, 533 + ... + 1254.

It is an arithmetic number, because the mean of its divisors is an integer number (113538).

2⁶⁴⁵¹⁰⁷ is an apocalyptic number.

645107 is a deficient number, since it is larger than the sum of its proper divisors (36121).

645107 is a wasteful number, since it uses less digits than its factorization.

645107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825 (or 1806 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 645107 is about 803.1855327382. The cubic root of 645107 is about 86.4060034552.

The spelling of 645107 in words is "six hundred forty-five thousand, one hundred seven".