820676389 has 4 divisors (see below), whose sum is σ = 883805356. Its totient is φ = 757547424.

The previous prime is 820676383. The next prime is 820676401. The reversal of 820676389 is 983676028.

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 57259489 + 763416900 = 7567^2 + 27630^2 .

It is a cyclic number.

It is not a de Polignac number, because 820676389 - 2²⁹ = 283805477 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 (820676383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31564464 + ... + 31564489.

It is an arithmetic number, because the mean of its divisors is an integer number (220951339).

Almost surely, 2^820676389 is an apocalyptic number.

It is an amenable number.

820676389 is a deficient number, since it is larger than the sum of its proper divisors (63128967).

820676389 is a wasteful number, since it uses less digits than its factorization.

820676389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63128966.

The product of its (nonzero) digits is 870912, while the sum is 49.

The square root of 820676389 is about 28647.4499563225. The cubic root of 820676389 is about 936.2474466464.

The spelling of 820676389 in words is "eight hundred twenty million, six hundred seventy-six thousand, three hundred eighty-nine".