215410820 has 12 divisors (see below), whose sum is σ = 452362764. Its totient is φ = 86164320.

The previous prime is 215410799. The next prime is 215410831. The reversal of 215410820 is 28014512.

It can be written as a sum of positive squares in 2 ways, for example, as 125843524 + 89567296 = 11218^2 + 9464^2 .

It is an unprimeable number.

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, 5385251 + ... + 5385290.

It is an arithmetic number, because the mean of its divisors is an integer number (37696897).

Almost surely, 2^215410820 is an apocalyptic number.

215410820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215410820 is an abundant number, since it is smaller than the sum of its proper divisors (236951944).

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

215410820 is a wasteful number, since it uses less digits than its factorization.

215410820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10770550 (or 10770548 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 215410820 is about 14676.8804587351. The cubic root of 215410820 is about 599.4539661922.

The spelling of 215410820 in words is "two hundred fifteen million, four hundred ten thousand, eight hundred twenty".