820677109 has 16 divisors (see below), whose sum is σ = 945230080. Its totient is φ = 697973760.

The previous prime is 820677101. The next prime is 820677113. The reversal of 820677109 is 901776028.

It is a cyclic number.

It is not a de Polignac number, because 820677109 - 2³ = 820677101 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 (820677101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 892552 + ... + 893470.

It is an arithmetic number, because the mean of its divisors is an integer number (59076880).

Almost surely, 2^820677109 is an apocalyptic number.

It is an amenable number.

820677109 is a deficient number, since it is larger than the sum of its proper divisors (124552971).

820677109 is a wasteful number, since it uses less digits than its factorization.

820677109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 820677109 is about 28647.4625228832. The cubic root of 820677109 is about 936.2477204441.

The spelling of 820677109 in words is "eight hundred twenty million, six hundred seventy-seven thousand, one hundred nine".