820965870 has 192 divisors, whose sum is σ = 2458460160. Its totient is φ = 188697600.

The previous prime is 820965869. The next prime is 820965881. The reversal of 820965870 is 78569028.

820965870 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 900715 + ... + 901625.

It is an arithmetic number, because the mean of its divisors is an integer number (12804480).

Almost surely, 2^820965870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 820965870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1229230080).

820965870 is an abundant number, since it is smaller than the sum of its proper divisors (1637494290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

820965870 is a wasteful number, since it uses less digits than its factorization.

820965870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991 (or 988 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 820965870 is about 28652.5019849925. The cubic root of 820965870 is about 936.3575160113.

The spelling of 820965870 in words is "eight hundred twenty million, nine hundred sixty-five thousand, eight hundred seventy".