215661030 has 64 divisors (see below), whose sum is σ = 558931968. Its totient is φ = 52940160.

The previous prime is 215661029. The next prime is 215661059. The reversal of 215661030 is 30166512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 236275 + ... + 237185.

It is an arithmetic number, because the mean of its divisors is an integer number (8733312).

Almost surely, 2^215661030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215661030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279465984).

215661030 is an abundant number, since it is smaller than the sum of its proper divisors (343270938).

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

215661030 is a wasteful number, since it uses less digits than its factorization.

215661030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 215661030 is about 14685.4019352553. The cubic root of 215661030 is about 599.6859745643.

The spelling of 215661030 in words is "two hundred fifteen million, six hundred sixty-one thousand, thirty".