645333333 has 16 divisors (see below), whose sum is σ = 898508160. Its totient is φ = 411217664.

The previous prime is 645333331. The next prime is 645333373. The reversal of 645333333 is 333333546.

It is a cyclic number.

It is not a de Polignac number, because 645333333 - 2¹ = 645333331 is a prime.

It is a super-2 number, since 2×645333333² = 832910221361777778, which contains 22 as substring.

645333333 is a modest number, since divided by 33333 gives 6453 as remainder.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 645333294 and 645333303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645333331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129553 + ... + 134441.

It is an arithmetic number, because the mean of its divisors is an integer number (56156760).

Almost surely, 2^645333333 is an apocalyptic number.

645333333 is the 14667-th octagonal number.

It is an amenable number.

645333333 is a deficient number, since it is larger than the sum of its proper divisors (253174827).

645333333 is a wasteful number, since it uses less digits than its factorization.

645333333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6828.

The product of its digits is 87480, while the sum is 33.

The square root of 645333333 is about 25403.4118377827. The cubic root of 645333333 is about 864.1610733111.

Adding to 645333333 its reverse (333333546), we get a palindrome (978666879).

The spelling of 645333333 in words is "six hundred forty-five million, three hundred thirty-three thousand, three hundred thirty-three".