10321640 has 64 divisors (see below), whose sum is σ = 26818560. Its totient is φ = 3502080.

The previous prime is 10321639. The next prime is 10321643. The reversal of 10321640 is 4612301.

It is not an unprimeable number, because it can be changed into a prime (10321643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53384 + ... + 53576.

It is an arithmetic number, because the mean of its divisors is an integer number (419040).

Almost surely, 2^10321640 is an apocalyptic number.

10321640 is a gapful number since it is divisible by the number (10) 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 10321640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13409280).

10321640 is an abundant number, since it is smaller than the sum of its proper divisors (16496920).

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

10321640 is a wasteful number, since it uses less digits than its factorization.

10321640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 10321640 is about 3212.7309255523. The cubic root of 10321640 is about 217.7289789161.

Adding to 10321640 its reverse (4612301), we get a palindrome (14933941).

The spelling of 10321640 in words is "ten million, three hundred twenty-one thousand, six hundred forty".