805628401 has 4 divisors (see below), whose sum is σ = 805806052. Its totient is φ = 805450752.

The previous prime is 805628389. The next prime is 805628423. The reversal of 805628401 is 104826508.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 434680801 + 370947600 = 20849^2 + 19260^2 .

It is a cyclic number.

It is not a de Polignac number, because 805628401 - 2⁷ = 805628273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (805628471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81840 + ... + 91153.

It is an arithmetic number, because the mean of its divisors is an integer number (201451513).

Almost surely, 2^805628401 is an apocalyptic number.

It is an amenable number.

805628401 is a deficient number, since it is larger than the sum of its proper divisors (177651).

805628401 is a wasteful number, since it uses less digits than its factorization.

805628401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177650.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 805628401 is about 28383.5938704034. The cubic root of 805628401 is about 930.4897412844.

The spelling of 805628401 in words is "eight hundred five million, six hundred twenty-eight thousand, four hundred one".