3721645400 has 144 divisors (see below), whose sum is σ = 9840776400. Its totient is φ = 1306412800.

The previous prime is 3721645309. The next prime is 3721645427. The reversal of 3721645400 is 45461273.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 699149 + ... + 704451.

It is an arithmetic number, because the mean of its divisors is an integer number (68338725).

Almost surely, 2^3721645400 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 3721645400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4920388200).

3721645400 is an abundant number, since it is smaller than the sum of its proper divisors (6119131000).

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

3721645400 is a wasteful number, since it uses less digits than its factorization.

3721645400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5370 (or 5350 counting only the distinct ones).

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

The square root of 3721645400 is about 61005.2899345622. The cubic root of 3721645400 is about 1549.6905938085.

The spelling of 3721645400 in words is "three billion, seven hundred twenty-one million, six hundred forty-five thousand, four hundred".