216291530 has 32 divisors (see below), whose sum is σ = 479170944. Its totient is φ = 68452416.

The previous prime is 216291511. The next prime is 216291539. The reversal of 216291530 is 35192612.

It is a junction number, because it is equal to n+sod(n) for n = 216291493 and 216291502.

It is not an unprimeable number, because it can be changed into a prime (216291539) 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 15 ways as a sum of consecutive naturals, for example, 117932 + ... + 119751.

It is an arithmetic number, because the mean of its divisors is an integer number (14974092).

Almost surely, 2^216291530 is an apocalyptic number.

216291530 is an abundant number, since it is smaller than the sum of its proper divisors (262879414).

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

216291530 is a wasteful number, since it uses less digits than its factorization.

216291530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237710.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 216291530 is about 14706.8531644264. The cubic root of 216291530 is about 600.2698138345.

The spelling of 216291530 in words is "two hundred sixteen million, two hundred ninety-one thousand, five hundred thirty".