216642046 has 8 divisors (see below), whose sum is σ = 325027800. Its totient is φ = 108299448.

The previous prime is 216642029. The next prime is 216642053. The reversal of 216642046 is 640246612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×216642046² = 93867552190132232, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216641999 and 216642017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9085 + ... + 22711.

It is an arithmetic number, because the mean of its divisors is an integer number (40628475).

Almost surely, 2^216642046 is an apocalyptic number.

216642046 is a deficient number, since it is larger than the sum of its proper divisors (108385754).

216642046 is a wasteful number, since it uses less digits than its factorization.

216642046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21578.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 216642046 is about 14718.7650976568. The cubic root of 216642046 is about 600.5938989831.

Adding to 216642046 its reverse (640246612), we get a palindrome (856888658).

The spelling of 216642046 in words is "two hundred sixteen million, six hundred forty-two thousand, forty-six".