645226033 has 8 divisors (see below), whose sum is σ = 667906560. Its totient is φ = 622662240.

The previous prime is 645226031. The next prime is 645226069. The reversal of 645226033 is 330622546.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645226033 - 2¹ = 645226031 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645225986 and 645226004.

It is not an unprimeable number, because it can be changed into a prime (645226031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17860 + ... + 40117.

It is an arithmetic number, because the mean of its divisors is an integer number (83488320).

Almost surely, 2^645226033 is an apocalyptic number.

It is an amenable number.

645226033 is a deficient number, since it is larger than the sum of its proper divisors (22680527).

645226033 is a wasteful number, since it uses less digits than its factorization.

645226033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58367.

The product of its (nonzero) digits is 25920, while the sum is 31.

The square root of 645226033 is about 25401.2998289458. The cubic root of 645226033 is about 864.1131757787.

Adding to 645226033 its reverse (330622546), we get a palindrome (975848579).

The spelling of 645226033 in words is "six hundred forty-five million, two hundred twenty-six thousand, thirty-three".