216774738 has 16 divisors (see below), whose sum is σ = 481721760. Its totient is φ = 72258228.

The previous prime is 216774721. The next prime is 216774757. The reversal of 216774738 is 837477612.

It is a junction number, because it is equal to n+sod(n) for n = 216774693 and 216774702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2007120 + ... + 2007227.

It is an arithmetic number, because the mean of its divisors is an integer number (30107610).

Almost surely, 2^216774738 is an apocalyptic number.

216774738 is an abundant number, since it is smaller than the sum of its proper divisors (264947022).

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

216774738 is a wasteful number, since it uses less digits than its factorization.

216774738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4014358 (or 4014352 counting only the distinct ones).

The product of its digits is 395136, while the sum is 45.

The square root of 216774738 is about 14723.2719868920. The cubic root of 216774738 is about 600.7164940532.

The spelling of 216774738 in words is "two hundred sixteen million, seven hundred seventy-four thousand, seven hundred thirty-eight".