215446640340 has 96 divisors (see below), whose sum is σ = 635224343040. Its totient is φ = 54409449600.

The previous prime is 215446640329. The next prime is 215446640389. The reversal of 215446640340 is 43046644512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3355135 + ... + 3418745.

It is an arithmetic number, because the mean of its divisors is an integer number (6616920240).

Almost surely, 2^215446640340 is an apocalyptic number.

215446640340 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 215446640340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317612171520).

215446640340 is an abundant number, since it is smaller than the sum of its proper divisors (419777702700).

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

215446640340 is a wasteful number, since it uses less digits than its factorization.

215446640340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66613 (or 66611 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 39.

The spelling of 215446640340 in words is "two hundred fifteen billion, four hundred forty-six million, six hundred forty thousand, three hundred forty".