216628783 has 6 divisors (see below), whose sum is σ = 247620264. Its totient is φ = 185648436.

The previous prime is 216628777. The next prime is 216628799. The reversal of 216628783 is 387826612.

It is not a de Polignac number, because 216628783 - 2¹⁷ = 216497711 is a prime.

It is a super-2 number, since 2×216628783² = 93856059248122178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216628483) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36160 + ... + 41722.

It is an arithmetic number, because the mean of its divisors is an integer number (41270044).

Almost surely, 2^216628783 is an apocalyptic number.

216628783 is a deficient number, since it is larger than the sum of its proper divisors (30991481).

216628783 is an frugal number, since it uses more digits than its factorization.

216628783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11133 (or 5570 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The square root of 216628783 is about 14718.3145434523. The cubic root of 216628783 is about 600.5816424527.

The spelling of 216628783 in words is "two hundred sixteen million, six hundred twenty-eight thousand, seven hundred eighty-three".