645254 has 4 divisors (see below), whose sum is σ = 967884. Its totient is φ = 322626.

The previous prime is 645233. The next prime is 645257. The reversal of 645254 is 452546.

It is a semiprime because it is the product of two primes.

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 645254.

It is not an unprimeable number, because it can be changed into a prime (645257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161312 + ... + 161315.

It is an arithmetic number, because the mean of its divisors is an integer number (241971).

2⁶⁴⁵²⁵⁴ is an apocalyptic number.

645254 is a deficient number, since it is larger than the sum of its proper divisors (322630).

645254 is a wasteful number, since it uses less digits than its factorization.

645254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322629.

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

The square root of 645254 is about 803.2770381382. The cubic root of 645254 is about 86.4125660450.

The spelling of 645254 in words is "six hundred forty-five thousand, two hundred fifty-four".