84805812 has 96 divisors (see below), whose sum is σ = 270636800. Its totient is φ = 22363776.

The previous prime is 84805793. The next prime is 84805823. The reversal of 84805812 is 21850848.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5514 + ... + 14142.

Almost surely, 2^84805812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84805812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135318400).

84805812 is an abundant number, since it is smaller than the sum of its proper divisors (185830988).

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

84805812 is a wasteful number, since it uses less digits than its factorization.

84805812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8662 (or 8654 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 84805812 is about 9209.0071126045. The cubic root of 84805812 is about 439.3478838500.

Subtracting from 84805812 its sum of digits (36), we obtain a triangular number (84805776 = T₁₃₀₂₃).

The spelling of 84805812 in words is "eighty-four million, eight hundred five thousand, eight hundred twelve".