3721777728 has 56 divisors (see below), whose sum is σ = 9872715840. Its totient is φ = 1237378560.

The previous prime is 3721777723. The next prime is 3721777739. The reversal of 3721777728 is 8277771273.

3721777728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (3721777721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49773 + ... + 99603.

Almost surely, 2^3721777728 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 3721777728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4936357920).

3721777728 is an abundant number, since it is smaller than the sum of its proper divisors (6150938112).

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

3721777728 is a wasteful number, since it uses less digits than its factorization.

3721777728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50235 (or 50225 counting only the distinct ones).

The product of its digits is 1613472, while the sum is 51.

The square root of 3721777728 is about 61006.3744866059. The cubic root of 3721777728 is about 1549.7089606870.

The spelling of 3721777728 in words is "three billion, seven hundred twenty-one million, seven hundred seventy-seven thousand, seven hundred twenty-eight".