645474 has 16 divisors (see below), whose sum is σ = 1300320. Its totient is φ = 213600.

The previous prime is 645467. The next prime is 645481. The reversal of 645474 is 474546.

645474 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 (645467) and next prime (645481).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645474.

It is an unprimeable number.

645474 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 774 + ... + 1374.

It is an arithmetic number, because the mean of its divisors is an integer number (81270).

2⁶⁴⁵⁴⁷⁴ is an apocalyptic number.

645474 is an abundant number, since it is smaller than the sum of its proper divisors (654846).

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

645474 is a wasteful number, since it uses less digits than its factorization.

645474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785.

The product of its digits is 13440, while the sum is 30.

The square root of 645474 is about 803.4139655246. The cubic root of 645474 is about 86.4223857461.

The spelling of 645474 in words is "six hundred forty-five thousand, four hundred seventy-four".