5640887621 has 8 divisors (see below), whose sum is σ = 5675256600. Its totient is φ = 5606572032.

The previous prime is 5640887617. The next prime is 5640887633. The reversal of 5640887621 is 1267880465.

It can be written as a sum of positive squares in 4 ways, for example, as 662032900 + 4978854721 = 25730^2 + 70561^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5640887621 - 2² = 5640887617 is a prime.

It is a super-2 number, since 2×5640887621² = 63639226305502079282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5640887671) 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, 209855 + ... + 235203.

It is an arithmetic number, because the mean of its divisors is an integer number (709407075).

Almost surely, 2^5640887621 is an apocalyptic number.

It is an amenable number.

5640887621 is a deficient number, since it is larger than the sum of its proper divisors (34368979).

5640887621 is a wasteful number, since it uses less digits than its factorization.

5640887621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26695.

The product of its (nonzero) digits is 645120, while the sum is 47.

The square root of 5640887621 is about 75105.8427886939. The cubic root of 5640887621 is about 1780.1194656383.

The spelling of 5640887621 in words is "five billion, six hundred forty million, eight hundred eighty-seven thousand, six hundred twenty-one".