215730648 has 128 divisors (see below), whose sum is σ = 696384000. Its totient is φ = 60600960.

The previous prime is 215730637. The next prime is 215730649. The reversal of 215730648 is 846037512.

215730648 is a `hidden beast` number, since 2 + 1 + 5 + 7 + 3 + 0 + 648 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215730649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91063 + ... + 93401.

It is an arithmetic number, because the mean of its divisors is an integer number (5440500).

Almost surely, 2^215730648 is an apocalyptic number.

215730648 is a gapful number since it is divisible by the number (28) 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 215730648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (348192000).

215730648 is an abundant number, since it is smaller than the sum of its proper divisors (480653352).

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

215730648 is a wasteful number, since it uses less digits than its factorization.

215730648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2422 (or 2412 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 215730648 is about 14687.7720570548. The cubic root of 215730648 is about 599.7504962609.

The spelling of 215730648 in words is "two hundred fifteen million, seven hundred thirty thousand, six hundred forty-eight".