820625305 has 4 divisors (see below), whose sum is σ = 984750372. Its totient is φ = 656500240.

The previous prime is 820625297. The next prime is 820625353. The reversal of 820625305 is 503526028.

It is a happy number.

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 543635856 + 276989449 = 23316^2 + 16643^2 .

It is not a de Polignac number, because 820625305 - 2³ = 820625297 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82062526 + ... + 82062535.

It is an arithmetic number, because the mean of its divisors is an integer number (246187593).

Almost surely, 2^820625305 is an apocalyptic number.

It is an amenable number.

820625305 is a deficient number, since it is larger than the sum of its proper divisors (164125067).

820625305 is a wasteful number, since it uses less digits than its factorization.

820625305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164125066.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 820625305 is about 28646.5583447646. The cubic root of 820625305 is about 936.2280202897.

The spelling of 820625305 in words is "eight hundred twenty million, six hundred twenty-five thousand, three hundred five".