812065890 has 96 divisors (see below), whose sum is σ = 2073859200. Its totient is φ = 203470848.

The previous prime is 812065883. The next prime is 812065901. The reversal of 812065890 is 98560218.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1808386 + ... + 1808834.

It is an arithmetic number, because the mean of its divisors is an integer number (21602700).

Almost surely, 2^812065890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 812065890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1036929600).

812065890 is an abundant number, since it is smaller than the sum of its proper divisors (1261793310).

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

812065890 is a wasteful number, since it uses less digits than its factorization.

812065890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 645 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 812065890 is about 28496.7698169459. The cubic root of 812065890 is about 932.9615728887.

The spelling of 812065890 in words is "eight hundred twelve million, sixty-five thousand, eight hundred ninety".