645240362340 has 144 divisors (see below), whose sum is σ = 2103965865792. Its totient is φ = 147320296704.

The previous prime is 645240362269. The next prime is 645240362353. The reversal of 645240362340 is 43263042546.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2545594 + ... + 2787566.

It is an arithmetic number, because the mean of its divisors is an integer number (14610874068).

Almost surely, 2^645240362340 is an apocalyptic number.

645240362340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645240362340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1051982932896).

645240362340 is an abundant number, since it is smaller than the sum of its proper divisors (1458725503452).

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

645240362340 is a wasteful number, since it uses less digits than its factorization.

645240362340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242906 (or 242897 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 39.

The spelling of 645240362340 in words is "six hundred forty-five billion, two hundred forty million, three hundred sixty-two thousand, three hundred forty".