216996090 has 32 divisors (see below), whose sum is σ = 522236160. Its totient is φ = 57705024.

The previous prime is 216996089. The next prime is 216996119. The reversal of 216996090 is 90699612.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1156 + ... + 20864.

It is an arithmetic number, because the mean of its divisors is an integer number (16319880).

Almost surely, 2^216996090 is an apocalyptic number.

216996090 is an abundant number, since it is smaller than the sum of its proper divisors (305240070).

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

216996090 is a wasteful number, since it uses less digits than its factorization.

216996090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20086.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 216996090 is about 14730.7871480108. The cubic root of 216996090 is about 600.9208914307.

The spelling of 216996090 in words is "two hundred sixteen million, nine hundred ninety-six thousand, ninety".