645972483240 has 768 divisors, whose sum is σ = 2531495116800. Its totient is φ = 139756492800.

The previous prime is 645972483181. The next prime is 645972483241. The reversal of 645972483240 is 42384279546.

It is a happy number.

645972483240 is a `hidden beast` number, since 6 + 4 + 59 + 72 + 483 + 2 + 40 = 666.

It is not an unprimeable number, because it can be changed into a prime (645972483241) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1348585321 + ... + 1348585799.

It is an arithmetic number, because the mean of its divisors is an integer number (3296217600).

Almost surely, 2^645972483240 is an apocalyptic number.

645972483240 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 645972483240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1265747558400).

645972483240 is an abundant number, since it is smaller than the sum of its proper divisors (1885522633560).

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

645972483240 is a wasteful number, since it uses less digits than its factorization.

645972483240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878 (or 871 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 54.

The spelling of 645972483240 in words is "six hundred forty-five billion, nine hundred seventy-two million, four hundred eighty-three thousand, two hundred forty".