5644370881 has 4 divisors (see below), whose sum is σ = 5649835972. Its totient is φ = 5638905792.

The previous prime is 5644370863. The next prime is 5644370917. The reversal of 5644370881 is 1880734465.

It is a happy number.

5644370881 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1880734465 = 5 ⋅376146893.

It can be written as a sum of positive squares in 2 ways, for example, as 4790854656 + 853516225 = 69216^2 + 29215^2 .

It is a cyclic number.

It is not a de Polignac number, because 5644370881 - 2²⁷ = 5510153153 is a prime.

It is a super-2 number, since 2×5644370881² = 63717845284561432322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5644370801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2730996 + ... + 2733061.

It is an arithmetic number, because the mean of its divisors is an integer number (1412458993).

Almost surely, 2^5644370881 is an apocalyptic number.

It is an amenable number.

5644370881 is a deficient number, since it is larger than the sum of its proper divisors (5465091).

5644370881 is a wasteful number, since it uses less digits than its factorization.

5644370881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5465090.

The product of its (nonzero) digits is 645120, while the sum is 46.

The square root of 5644370881 is about 75129.0282181262. The cubic root of 5644370881 is about 1780.4857994192.

The spelling of 5644370881 in words is "five billion, six hundred forty-four million, three hundred seventy thousand, eight hundred eighty-one".