215675028864 has 256 divisors, whose sum is σ = 665023680000. Its totient is φ = 68682442752.

The previous prime is 215675028797. The next prime is 215675028911. The reversal of 215675028864 is 468820576512.

215675028864 is a `hidden beast` number, since 2 + 1 + 56 + 7 + 502 + 8 + 86 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 215675028864.

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, 126941487 + ... + 126943185.

It is an arithmetic number, because the mean of its divisors is an integer number (2597748750).

Almost surely, 2^215675028864 is an apocalyptic number.

215675028864 is a gapful number since it is divisible by the number (24) 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 215675028864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332511840000).

215675028864 is an abundant number, since it is smaller than the sum of its proper divisors (449348651136).

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

215675028864 is a wasteful number, since it uses less digits than its factorization.

215675028864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3342 (or 3324 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 54.

The spelling of 215675028864 in words is "two hundred fifteen billion, six hundred seventy-five million, twenty-eight thousand, eight hundred sixty-four".