11311403640 has 128 divisors (see below), whose sum is σ = 34521500160. Its totient is φ = 2964386304.

The previous prime is 11311403599. The next prime is 11311403651. The reversal of 11311403640 is 4630411311.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 11311403640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4042722 + ... + 4045518.

It is an arithmetic number, because the mean of its divisors is an integer number (269699220).

Almost surely, 2^11311403640 is an apocalyptic number.

11311403640 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 11311403640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17260750080).

11311403640 is an abundant number, since it is smaller than the sum of its proper divisors (23210096520).

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

11311403640 is a wasteful number, since it uses less digits than its factorization.

11311403640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3381 (or 3377 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 11311403640 its reverse (4630411311), we get a palindrome (15941814951).

The spelling of 11311403640 in words is "eleven billion, three hundred eleven million, four hundred three thousand, six hundred forty".