215285856 has 48 divisors (see below), whose sum is σ = 566092800. Its totient is φ = 71639168.

The previous prime is 215285849. The next prime is 215285881. The reversal of 215285856 is 658582512.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67465 + ... + 70583.

It is an arithmetic number, because the mean of its divisors is an integer number (11793600).

Almost surely, 2^215285856 is an apocalyptic number.

It is an amenable number.

215285856 is an abundant number, since it is smaller than the sum of its proper divisors (350806944).

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

215285856 is a wasteful number, since it uses less digits than its factorization.

215285856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3851 (or 3843 counting only the distinct ones).

The product of its digits is 192000, while the sum is 42.

The square root of 215285856 is about 14672.6226694480. The cubic root of 215285856 is about 599.3380254737.

The spelling of 215285856 in words is "two hundred fifteen million, two hundred eighty-five thousand, eight hundred fifty-six".