3721891600 has 120 divisors (see below), whose sum is σ = 10820521728. Its totient is φ = 1200998400.

The previous prime is 3721891573. The next prime is 3721891603. The reversal of 3721891600 is 61981273.

It is a self number, because there is not a number n which added to its sum of digits gives 3721891600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3721891603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8505 + ... + 86695.

Almost surely, 2^3721891600 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 3721891600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5410260864).

3721891600 is an abundant number, since it is smaller than the sum of its proper divisors (7098630128).

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

3721891600 is a wasteful number, since it uses less digits than its factorization.

3721891600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78233 (or 78222 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 3721891600 is about 61007.3077589890. The cubic root of 3721891600 is about 1549.7247655588.

The spelling of 3721891600 in words is "three billion, seven hundred twenty-one million, eight hundred ninety-one thousand, six hundred".