216990476 has 12 divisors (see below), whose sum is σ = 380138472. Its totient is φ = 108379488.

The previous prime is 216990467. The next prime is 216990503. The reversal of 216990476 is 674099612.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24650 + ... + 32273.

It is an arithmetic number, because the mean of its divisors is an integer number (31678206).

Almost surely, 2^216990476 is an apocalyptic number.

It is an amenable number.

216990476 is a deficient number, since it is larger than the sum of its proper divisors (163147996).

216990476 is a wasteful number, since it uses less digits than its factorization.

216990476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57880 (or 57878 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 216990476 is about 14730.5965934853. The cubic root of 216990476 is about 600.9157091577.

The spelling of 216990476 in words is "two hundred sixteen million, nine hundred ninety thousand, four hundred seventy-six".