215449890 has 64 divisors (see below), whose sum is σ = 539167104. Its totient is φ = 55047168.

The previous prime is 215449877. The next prime is 215449921. The reversal of 215449890 is 98944512.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72922 + ... + 75818.

It is an arithmetic number, because the mean of its divisors is an integer number (8424486).

Almost surely, 2^215449890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215449890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269583552).

215449890 is an abundant number, since it is smaller than the sum of its proper divisors (323717214).

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

215449890 is a wasteful number, since it uses less digits than its factorization.

215449890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3011.

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 215449890 is about 14678.2114033012. The cubic root of 215449890 is about 599.4902058615.

The spelling of 215449890 in words is "two hundred fifteen million, four hundred forty-nine thousand, eight hundred ninety".