645772 has 24 divisors (see below), whose sum is σ = 1234800. Its totient is φ = 294336.

The previous prime is 645763. The next prime is 645787. The reversal of 645772 is 277546.

645772 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 2058 + ... + 2350.

It is an arithmetic number, because the mean of its divisors is an integer number (51450).

2⁶⁴⁵⁷⁷² is an apocalyptic number.

It is an amenable number.

645772 is a deficient number, since it is larger than the sum of its proper divisors (589028).

645772 is a wasteful number, since it uses less digits than its factorization.

645772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 343 counting only the distinct ones).

The product of its digits is 11760, while the sum is 31.

The square root of 645772 is about 803.5994026877. The cubic root of 645772 is about 86.4356834202.

The spelling of 645772 in words is "six hundred forty-five thousand, seven hundred seventy-two".