216479854 has 4 divisors (see below), whose sum is σ = 324719784. Its totient is φ = 108239926.

The previous prime is 216479849. The next prime is 216479869. The reversal of 216479854 is 458974612.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×216479854² = 93727054375722632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54119962 + ... + 54119965.

It is an arithmetic number, because the mean of its divisors is an integer number (81179946).

Almost surely, 2^216479854 is an apocalyptic number.

216479854 is a deficient number, since it is larger than the sum of its proper divisors (108239930).

216479854 is a wasteful number, since it uses less digits than its factorization.

216479854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108239929.

The product of its digits is 483840, while the sum is 46.

The square root of 216479854 is about 14713.2543646876. The cubic root of 216479854 is about 600.4439806469.

The spelling of 216479854 in words is "two hundred sixteen million, four hundred seventy-nine thousand, eight hundred fifty-four".