216506424 has 32 divisors (see below), whose sum is σ = 573106320. Its totient is φ = 67923456.

The previous prime is 216506417. The next prime is 216506461. The reversal of 216506424 is 424605612.

It is a junction number, because it is equal to n+sod(n) for n = 216506391 and 216506400.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 264919 + ... + 265734.

Almost surely, 2^216506424 is an apocalyptic number.

216506424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

216506424 is an abundant number, since it is smaller than the sum of its proper divisors (356599896).

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

216506424 is a wasteful number, since it uses less digits than its factorization.

216506424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530679 (or 530675 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 216506424 is about 14714.1572643492. The cubic root of 216506424 is about 600.4685451250.

The spelling of 216506424 in words is "two hundred sixteen million, five hundred six thousand, four hundred twenty-four".