645470 has 16 divisors (see below), whose sum is σ = 1327968. Its totient is φ = 221280.

The previous prime is 645467. The next prime is 645481. The reversal of 645470 is 74546.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645470.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4541 + ... + 4680.

It is an arithmetic number, because the mean of its divisors is an integer number (82998).

2⁶⁴⁵⁴⁷⁰ is an apocalyptic number.

645470 is an abundant number, since it is smaller than the sum of its proper divisors (682498).

It is a weird number, because it is abundant, but not a pseudoperfect number.

645470 is a wasteful number, since it uses less digits than its factorization.

645470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9235.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 645470 is about 803.4114761441. The cubic root of 645470 is about 86.4222072260.

The spelling of 645470 in words is "six hundred forty-five thousand, four hundred seventy".