84216906 has 24 divisors (see below), whose sum is σ = 183158820. Its totient is φ = 27966336.

The previous prime is 84216883. The next prime is 84216907. The reversal of 84216906 is 60961248.

It can be written as a sum of positive squares in 2 ways, for example, as 70711281 + 13505625 = 8409^2 + 3675^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (84216907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3855 + ... + 13538.

Almost surely, 2^84216906 is an apocalyptic number.

84216906 is an abundant number, since it is smaller than the sum of its proper divisors (98941914).

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

84216906 is a wasteful number, since it uses less digits than its factorization.

84216906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17670 (or 17667 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 84216906 is about 9176.9769532238. The cubic root of 84216906 is about 438.3285518842.

The spelling of 84216906 in words is "eighty-four million, two hundred sixteen thousand, nine hundred six".