216628580 has 24 divisors (see below), whose sum is σ = 519908928. Its totient is φ = 74272608.

The previous prime is 216628553. The next prime is 216628591. The reversal of 216628580 is 85826612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 773534 + ... + 773813.

It is an arithmetic number, because the mean of its divisors is an integer number (21662872).

Almost surely, 2^216628580 is an apocalyptic number.

216628580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216628580 is an abundant number, since it is smaller than the sum of its proper divisors (303280348).

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

216628580 is a wasteful number, since it uses less digits than its factorization.

216628580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547363 (or 1547361 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 216628580 is about 14718.3076472806. The cubic root of 216628580 is about 600.5814548536.

The spelling of 216628580 in words is "two hundred sixteen million, six hundred twenty-eight thousand, five hundred eighty".