215329647240 has 128 divisors (see below), whose sum is σ = 720434736000. Its totient is φ = 57207700224.

The previous prime is 215329647193. The next prime is 215329647241. The reversal of 215329647240 is 42746923512.

215329647240 is a `hidden beast` number, since 2 + 1 + 53 + 2 + 96 + 472 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (215329647241) 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, 80074 + ... + 661113.

It is an arithmetic number, because the mean of its divisors is an integer number (5628396375).

Almost surely, 2^215329647240 is an apocalyptic number.

215329647240 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 215329647240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (360217368000).

215329647240 is an abundant number, since it is smaller than the sum of its proper divisors (505105088760).

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

215329647240 is a wasteful number, since it uses less digits than its factorization.

215329647240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741476 (or 741466 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 215329647240 in words is "two hundred fifteen billion, three hundred twenty-nine million, six hundred forty-seven thousand, two hundred forty".