13765731840 has 640 divisors, whose sum is σ = 58359121920. Its totient is φ = 3007217664.

The previous prime is 13765731839. The next prime is 13765731869. The reversal of 13765731840 is 4813756731.

13765731840 is a `hidden beast` number, since 1 + 3 + 76 + 573 + 1 + 8 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11127702 + ... + 11128938.

It is an arithmetic number, because the mean of its divisors is an integer number (91186128).

Almost surely, 2^13765731840 is an apocalyptic number.

13765731840 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 13765731840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29179560960).

13765731840 is an abundant number, since it is smaller than the sum of its proper divisors (44593390080).

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

13765731840 is a wasteful number, since it uses less digits than its factorization.

13765731840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299 (or 1277 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 13765731840 in words is "thirteen billion, seven hundred sixty-five million, seven hundred thirty-one thousand, eight hundred forty".