6321145640 has 32 divisors (see below), whose sum is σ = 14224896000. Its totient is φ = 2528046144.

The previous prime is 6321145639. The next prime is 6321145651. The reversal of 6321145640 is 465411236.

It is a junction number, because it is equal to n+sod(n) for n = 6321145597 and 6321145606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395321 + ... + 410999.

It is an arithmetic number, because the mean of its divisors is an integer number (444528000).

Almost surely, 2^6321145640 is an apocalyptic number.

It is an amenable number.

6321145640 is an abundant number, since it is smaller than the sum of its proper divisors (7903750360).

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

6321145640 is a wasteful number, since it uses less digits than its factorization.

6321145640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25769 (or 25765 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 6321145640 is about 79505.6327564280. The cubic root of 6321145640 is about 1848.9788023645.

Adding to 6321145640 its reverse (465411236), we get a palindrome (6786556876).

The spelling of 6321145640 in words is "six billion, three hundred twenty-one million, one hundred forty-five thousand, six hundred forty".