215115450 has 96 divisors (see below), whose sum is σ = 616299840. Its totient is φ = 49075200.

The previous prime is 215115449. The next prime is 215115503. The reversal of 215115450 is 54511512.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 215115450.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24216 + ... + 31884.

It is an arithmetic number, because the mean of its divisors is an integer number (6419790).

Almost surely, 2^215115450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215115450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (308149920).

215115450 is an abundant number, since it is smaller than the sum of its proper divisors (401184390).

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

215115450 is a wasteful number, since it uses less digits than its factorization.

215115450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7712 (or 7707 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 215115450 is about 14666.8145825875. The cubic root of 215115450 is about 599.1798516609.

Adding to 215115450 its reverse (54511512), we get a palindrome (269626962).

The spelling of 215115450 in words is "two hundred fifteen million, one hundred fifteen thousand, four hundred fifty".