3750221640 has 128 divisors (see below), whose sum is σ = 12429158400. Its totient is φ = 897611520.

The previous prime is 3750221611. The next prime is 3750221659. The reversal of 3750221640 is 461220573.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 3750221598 and 3750221607.

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 31 ways as a sum of consecutive naturals, for example, 86299 + ... + 122261.

It is an arithmetic number, because the mean of its divisors is an integer number (97102800).

Almost surely, 2^3750221640 is an apocalyptic number.

3750221640 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 3750221640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6214579200).

3750221640 is an abundant number, since it is smaller than the sum of its proper divisors (8678936760).

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

3750221640 is a wasteful number, since it uses less digits than its factorization.

3750221640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36067 (or 36063 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 3750221640 is about 61239.0532258623. The cubic root of 3750221640 is about 1553.6468606856.

The spelling of 3750221640 in words is "three billion, seven hundred fifty million, two hundred twenty-one thousand, six hundred forty".