820779836 has 12 divisors (see below), whose sum is σ = 1463466312. Its totient is φ = 402646608.

The previous prime is 820779823. The next prime is 820779851. The reversal of 820779836 is 638977028.

It is a happy number.

820779836 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent 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, 1935590 + ... + 1936013.

It is an arithmetic number, because the mean of its divisors is an integer number (121955526).

Almost surely, 2^820779836 is an apocalyptic number.

It is an amenable number.

820779836 is a deficient number, since it is larger than the sum of its proper divisors (642686476).

820779836 is a wasteful number, since it uses less digits than its factorization.

820779836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3871660 (or 3871658 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 50.

The square root of 820779836 is about 28649.2554178987. The cubic root of 820779836 is about 936.2867832724.

The spelling of 820779836 in words is "eight hundred twenty million, seven hundred seventy-nine thousand, eight hundred thirty-six".