820446289 has 16 divisors (see below), whose sum is σ = 903927808. Its totient is φ = 740057472.

The previous prime is 820446259. The next prime is 820446293. The reversal of 820446289 is 982644028.

It is a cyclic number.

It is not a de Polignac number, because 820446289 - 2⁵ = 820446257 is a prime.

It is a super-2 number, since 2×820446289² = 1346264226267743042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820446259) 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, 106909 + ... + 114325.

It is an arithmetic number, because the mean of its divisors is an integer number (56495488).

Almost surely, 2^820446289 is an apocalyptic number.

It is an amenable number.

820446289 is a deficient number, since it is larger than the sum of its proper divisors (83481519).

820446289 is a wasteful number, since it uses less digits than its factorization.

820446289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7624.

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 820446289 is about 28643.4336105153. The cubic root of 820446289 is about 936.1599372548.

The spelling of 820446289 in words is "eight hundred twenty million, four hundred forty-six thousand, two hundred eighty-nine".