216734740 has 12 divisors (see below), whose sum is σ = 455142996. Its totient is φ = 86693888.

The previous prime is 216734723. The next prime is 216734741. The reversal of 216734740 is 47437612.

It can be written as a sum of positive squares in 2 ways, for example, as 49084036 + 167650704 = 7006^2 + 12948^2 .

It is a junction number, because it is equal to n+sod(n) for n = 216734696 and 216734705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216734741) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5418349 + ... + 5418388.

It is an arithmetic number, because the mean of its divisors is an integer number (37928583).

Almost surely, 2^216734740 is an apocalyptic number.

216734740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216734740 is an abundant number, since it is smaller than the sum of its proper divisors (238408256).

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

216734740 is a wasteful number, since it uses less digits than its factorization.

216734740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10836746 (or 10836744 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 216734740 is about 14721.9135984423. The cubic root of 216734740 is about 600.6795448888.

The spelling of 216734740 in words is "two hundred sixteen million, seven hundred thirty-four thousand, seven hundred forty".