645624432240 has 160 divisors (see below), whose sum is σ = 2052202031616. Its totient is φ = 167816033280.

The previous prime is 645624432203. The next prime is 645624432251. The reversal of 645624432240 is 42234426546.

It is a junction number, because it is equal to n+sod(n) for n = 645624432192 and 645624432201.

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 31 ways as a sum of consecutive naturals, for example, 4961610 + ... + 5090070.

Almost surely, 2^645624432240 is an apocalyptic number.

645624432240 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 645624432240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1026101015808).

645624432240 is an abundant number, since it is smaller than the sum of its proper divisors (1406577599376).

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

645624432240 is a wasteful number, since it uses less digits than its factorization.

645624432240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129007 (or 129001 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 42.

Adding to 645624432240 its reverse (42234426546), we get a palindrome (687858858786).

The spelling of 645624432240 in words is "six hundred forty-five billion, six hundred twenty-four million, four hundred thirty-two thousand, two hundred forty".