645789024 has 336 divisors, whose sum is σ = 2115348480. Its totient is φ = 193155840.

The previous prime is 645789019. The next prime is 645789041. The reversal of 645789024 is 420987546.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 13740169 + ... + 13740215.

It is an arithmetic number, because the mean of its divisors is an integer number (6295680).

Almost surely, 2^645789024 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645789024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1057674240).

645789024 is an abundant number, since it is smaller than the sum of its proper divisors (1469559456).

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

645789024 is a wasteful number, since it uses less digits than its factorization.

645789024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 645789024 is about 25412.3793455080. The cubic root of 645789024 is about 864.3644295977.

It can be divided in two parts, 6457 and 89024, that added together give a square (95481 = 309²).

The spelling of 645789024 in words is "six hundred forty-five million, seven hundred eighty-nine thousand, twenty-four".