820576061 has 4 divisors (see below), whose sum is σ = 821643900. Its totient is φ = 819508224.

The previous prime is 820576049. The next prime is 820576063. The reversal of 820576061 is 160675028.

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 201810436 + 618765625 = 14206^2 + 24875^2 .

It is a cyclic number.

It is not a de Polignac number, because 820576061 - 2⁶ = 820575997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820576063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532766 + ... + 534303.

It is an arithmetic number, because the mean of its divisors is an integer number (205410975).

Almost surely, 2^820576061 is an apocalyptic number.

It is an amenable number.

820576061 is a deficient number, since it is larger than the sum of its proper divisors (1067839).

820576061 is a wasteful number, since it uses less digits than its factorization.

820576061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067838.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 820576061 is about 28645.6988219872. The cubic root of 820576061 is about 936.2092928897.

The spelling of 820576061 in words is "eight hundred twenty million, five hundred seventy-six thousand, sixty-one".