645020262 has 48 divisors (see below), whose sum is σ = 1465626240. Its totient is φ = 204736896.

The previous prime is 645020251. The next prime is 645020263. The reversal of 645020262 is 262020546.

645020262 is a `hidden beast` number, since 6 + 450 + 202 + 6 + 2 = 666.

645020262 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×645020262² = 832102276781097288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645020263) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29643 + ... + 46569.

It is an arithmetic number, because the mean of its divisors is an integer number (30533880).

Almost surely, 2^645020262 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645020262, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (732813120).

645020262 is an abundant number, since it is smaller than the sum of its proper divisors (820605978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645020262 is a wasteful number, since it uses less digits than its factorization.

645020262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17037 (or 17034 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 645020262 is about 25397.2491030033. The cubic root of 645020262 is about 864.0213070234.

The spelling of 645020262 in words is "six hundred forty-five million, twenty thousand, two hundred sixty-two".