800605621 has 8 divisors (see below), whose sum is σ = 805093560. Its totient is φ = 796129728.

The previous prime is 800605607. The next prime is 800605649. The reversal of 800605621 is 126506008.

It can be written as a sum of positive squares in 4 ways, for example, as 12680721 + 787924900 = 3561^2 + 28070^2 .

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 800605621 - 2¹⁵ = 800572853 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 800605621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (800705621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151695 + ... + 156883.

It is an arithmetic number, because the mean of its divisors is an integer number (100636695).

Almost surely, 2^800605621 is an apocalyptic number.

It is an amenable number.

800605621 is a deficient number, since it is larger than the sum of its proper divisors (4487939).

800605621 is a wasteful number, since it uses less digits than its factorization.

800605621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6023.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 800605621 is about 28294.9751899520. The cubic root of 800605621 is about 928.5519612746.

The spelling of 800605621 in words is "eight hundred million, six hundred five thousand, six hundred twenty-one".