645353236 has 24 divisors (see below), whose sum is σ = 1244244960. Its totient is φ = 290436000.

The previous prime is 645353197. The next prime is 645353263. The reversal of 645353236 is 632353546.

It is a junction number, because it is equal to n+sod(n) for n = 645353195 and 645353204.

It is a congruent number.

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, 68166 + ... + 77053.

It is an arithmetic number, because the mean of its divisors is an integer number (51843540).

Almost surely, 2^645353236 is an apocalyptic number.

It is an amenable number.

645353236 is a deficient number, since it is larger than the sum of its proper divisors (598891724).

645353236 is a wasteful number, since it uses less digits than its factorization.

645353236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145335 (or 145333 counting only the distinct ones).

The product of its digits is 194400, while the sum is 37.

The square root of 645353236 is about 25403.8035734809. The cubic root of 645353236 is about 864.1699572063.

The spelling of 645353236 in words is "six hundred forty-five million, three hundred fifty-three thousand, two hundred thirty-six".