215649460 has 48 divisors (see below), whose sum is σ = 493920000. Its totient is φ = 78609024.

The previous prime is 215649439. The next prime is 215649491. The reversal of 215649460 is 64946512.

215649460 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15291 + ... + 25789.

It is an arithmetic number, because the mean of its divisors is an integer number (10290000).

Almost surely, 2^215649460 is an apocalyptic number.

215649460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215649460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246960000).

215649460 is an abundant number, since it is smaller than the sum of its proper divisors (278270540).

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

215649460 is a wasteful number, since it uses less digits than its factorization.

215649460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10600 (or 10598 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 215649460 is about 14685.0080013598. The cubic root of 215649460 is about 599.6752501869.

The spelling of 215649460 in words is "two hundred fifteen million, six hundred forty-nine thousand, four hundred sixty".