216624340 has 12 divisors (see below), whose sum is σ = 454911156. Its totient is φ = 86649728.

The previous prime is 216624329. The next prime is 216624349. The reversal of 216624340 is 43426612.

It can be written as a sum of positive squares in 2 ways, for example, as 58920976 + 157703364 = 7676^2 + 12558^2 .

It is a super-2 number, since 2×216624340² = 93852209360871200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216624299 and 216624308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216624349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5415589 + ... + 5415628.

It is an arithmetic number, because the mean of its divisors is an integer number (37909263).

Almost surely, 2^216624340 is an apocalyptic number.

216624340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216624340 is an abundant number, since it is smaller than the sum of its proper divisors (238286816).

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

216624340 is a wasteful number, since it uses less digits than its factorization.

216624340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10831226 (or 10831224 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 216624340 is about 14718.1636082767. The cubic root of 216624340 is about 600.5775365002.

The spelling of 216624340 in words is "two hundred sixteen million, six hundred twenty-four thousand, three hundred forty".