215285577408 has 672 divisors, whose sum is σ = 735528729600. Its totient is φ = 61577809920.

The previous prime is 215285577379. The next prime is 215285577499. The reversal of 215285577408 is 804775582512.

It is a happy number.

215285577408 is a `hidden beast` number, since 2 + 1 + 5 + 28 + 5 + 577 + 40 + 8 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 428002885 + ... + 428003387.

It is an arithmetic number, because the mean of its divisors is an integer number (1094536800).

Almost surely, 2^215285577408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215285577408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (367764364800).

215285577408 is an abundant number, since it is smaller than the sum of its proper divisors (520243152192).

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

215285577408 is a wasteful number, since it uses less digits than its factorization.

215285577408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 6272000, while the sum is 54.

The spelling of 215285577408 in words is "two hundred fifteen billion, two hundred eighty-five million, five hundred seventy-seven thousand, four hundred eight".