215226615240 has 1024 divisors, whose sum is σ = 934236979200. Its totient is φ = 42848870400.

The previous prime is 215226615217. The next prime is 215226615259. The reversal of 215226615240 is 42516622512.

215226615240 is a `hidden beast` number, since 2 + 1 + 52 + 26 + 61 + 524 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 215226615195 and 215226615204.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 124913019 + ... + 124914741.

It is an arithmetic number, because the mean of its divisors is an integer number (912340800).

Almost surely, 2^215226615240 is an apocalyptic number.

215226615240 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 215226615240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (467118489600).

215226615240 is an abundant number, since it is smaller than the sum of its proper divisors (719010363960).

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

215226615240 is a wasteful number, since it uses less digits than its factorization.

215226615240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835 (or 1825 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 215226615240 in words is "two hundred fifteen billion, two hundred twenty-six million, six hundred fifteen thousand, two hundred forty".