3721540640 has 96 divisors (see below), whose sum is σ = 9412200000. Its totient is φ = 1386298368.

The previous prime is 3721540639. The next prime is 3721540649. The reversal of 3721540640 is 460451273.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 3721540597 and 3721540606.

It is not an unprimeable number, because it can be changed into a prime (3721540649) 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, 168986 + ... + 189734.

It is an arithmetic number, because the mean of its divisors is an integer number (98043750).

Almost surely, 2^3721540640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3721540640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4706100000).

3721540640 is an abundant number, since it is smaller than the sum of its proper divisors (5690659360).

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

3721540640 is a wasteful number, since it uses less digits than its factorization.

3721540640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20842 (or 20834 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 3721540640 is about 61004.4313144545. The cubic root of 3721540640 is about 1549.6760530080.

The spelling of 3721540640 in words is "three billion, seven hundred twenty-one million, five hundred forty thousand, six hundred forty".