215420556 has 48 divisors (see below), whose sum is σ = 569811200. Its totient is φ = 62793792.

The previous prime is 215420551. The next prime is 215420563. The reversal of 215420556 is 655024512.

215420556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (215420551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33376 + ... + 39303.

Almost surely, 2^215420556 is an apocalyptic number.

215420556 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

215420556 is an abundant number, since it is smaller than the sum of its proper divisors (354390644).

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

215420556 is a wasteful number, since it uses less digits than its factorization.

215420556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72718 (or 72716 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 215420556 is about 14677.2121330994. The cubic root of 215420556 is about 599.4629973013.

The spelling of 215420556 in words is "two hundred fifteen million, four hundred twenty thousand, five hundred fifty-six".