3721515840 has 784 divisors, whose sum is σ = 15831116928. Its totient is φ = 815173632.

The previous prime is 3721515761. The next prime is 3721515887. The reversal of 3721515840 is 485151273.

3721515840 is a `hidden beast` number, since 3 + 7 + 21 + 51 + 584 + 0 = 666.

3721515840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 3721515795 and 3721515804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 70217254 + ... + 70217306.

Almost surely, 2^3721515840 is an apocalyptic number.

3721515840 is a gapful number since it is divisible by the number (30) 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 3721515840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7915558464).

3721515840 is an abundant number, since it is smaller than the sum of its proper divisors (12109601088).

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

3721515840 is an equidigital number, since it uses as much as digits as its factorization.

3721515840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 3721515840 is about 61004.2280501934. The cubic root of 3721515840 is about 1549.6726107014.

The spelling of 3721515840 in words is "three billion, seven hundred twenty-one million, five hundred fifteen thousand, eight hundred forty".