3728637821940 has 48 divisors (see below), whose sum is σ = 10500533826048. Its totient is φ = 988555997824.

The previous prime is 3728637821939. The next prime is 3728637821957. The reversal of 3728637821940 is 491287368273.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179596452 + ... + 179617211.

It is an arithmetic number, because the mean of its divisors is an integer number (218761121376).

Almost surely, 2^{3728637821940} is an apocalyptic number.

3728637821940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3728637821940 is an abundant number, since it is smaller than the sum of its proper divisors (6771896004108).

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

3728637821940 is a wasteful number, since it uses less digits than its factorization.

3728637821940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359213848 (or 359213846 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 60.

The spelling of 3728637821940 in words is "three trillion, seven hundred twenty-eight billion, six hundred thirty-seven million, eight hundred twenty-one thousand, nine hundred forty".