215282215440 has 60 divisors (see below), whose sum is σ = 722989442604. Its totient is φ = 57408590592.

The previous prime is 215282215391. The next prime is 215282215469. The reversal of 215282215440 is 44512282512.

215282215440 is a `hidden beast` number, since 2 + 15 + 2 + 82 + 21 + 544 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 137528239104 + 77753976336 = 370848^2 + 278844^2 .

It is a tau number, because it is divible by the number of its divisors (60).

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 = 215282215395 and 215282215404.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149500819 + ... + 149502258.

Almost surely, 2^215282215440 is an apocalyptic number.

215282215440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215282215440 is an abundant number, since it is smaller than the sum of its proper divisors (507707227164).

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

215282215440 is a wasteful number, since it uses less digits than its factorization.

215282215440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299003096 (or 299003087 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 36.

Adding to 215282215440 its reverse (44512282512), we get a palindrome (259794497952).

The spelling of 215282215440 in words is "two hundred fifteen billion, two hundred eighty-two million, two hundred fifteen thousand, four hundred forty".