216620424 has 24 divisors (see below), whose sum is σ = 586680510. Its totient is φ = 72206784.

The previous prime is 216620423. The next prime is 216620429. The reversal of 216620424 is 424026612.

216620424 is a `hidden beast` number, since 2 + 16 + 620 + 4 + 24 = 666.

216620424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 216619524 + 900 = 14718^2 + 30^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (216620423) 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, 1504237 + ... + 1504380.

Almost surely, 2^216620424 is an apocalyptic number.

216620424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

216620424 is an abundant number, since it is smaller than the sum of its proper divisors (370060086).

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

216620424 is a wasteful number, since it uses less digits than its factorization.

216620424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3008629 (or 3008622 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 216620424 is about 14718.0305747746. The cubic root of 216620424 is about 600.5739175228.

The spelling of 216620424 in words is "two hundred sixteen million, six hundred twenty thousand, four hundred twenty-four".