215438685880320 has 840 divisors, whose sum is σ = 885945695783904. Its totient is φ = 49243032649728.

The previous prime is 215438685880289. The next prime is 215438685880367. The reversal of 215438685880320 is 23088586834512.

215438685880320 is a `hidden beast` number, since 2 + 1 + 5 + 43 + 8 + 6 + 8 + 588 + 0 + 3 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (840).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 417780082 + ... + 418295438.

Almost surely, 2^{215438685880320} is an apocalyptic number.

215438685880320 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 215438685880320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (442972847891952).

215438685880320 is an abundant number, since it is smaller than the sum of its proper divisors (670507009903584).

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

215438685880320 is an frugal number, since it uses more digits than its factorization.

215438685880320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515415 (or 515374 counting only the distinct ones).

The product of its (nonzero) digits is 88473600, while the sum is 63.

The spelling of 215438685880320 in words is "two hundred fifteen trillion, four hundred thirty-eight billion, six hundred eighty-five million, eight hundred eighty thousand, three hundred twenty".