2175420644 has 6 divisors (see below), whose sum is σ = 3806986134. Its totient is φ = 1087710320.

The previous prime is 2175420631. The next prime is 2175420673. The reversal of 2175420644 is 4460245712.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2175289600 + 131044 = 46640^2 + 362^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271927577 + ... + 271927584.

It is an arithmetic number, because the mean of its divisors is an integer number (634497689).

Almost surely, 2^2175420644 is an apocalyptic number.

It is an amenable number.

2175420644 is a deficient number, since it is larger than the sum of its proper divisors (1631565490).

2175420644 is a wasteful number, since it uses less digits than its factorization.

2175420644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543855165 (or 543855163 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 35.

The square root of 2175420644 is about 46641.4048244690. The cubic root of 2175420644 is about 1295.7297048779.

The spelling of 2175420644 in words is "two billion, one hundred seventy-five million, four hundred twenty thousand, six hundred forty-four".