215455280 has 60 divisors (see below), whose sum is σ = 532190640. Its totient is φ = 81103872.

The previous prime is 215455277. The next prime is 215455291. The reversal of 215455280 is 82554512.

215455280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18461 + ... + 27779.

It is an arithmetic number, because the mean of its divisors is an integer number (8869844).

Almost surely, 2^215455280 is an apocalyptic number.

215455280 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 215455280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266095320).

215455280 is an abundant number, since it is smaller than the sum of its proper divisors (316735360).

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

215455280 is a wasteful number, since it uses less digits than its factorization.

215455280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9366 (or 9343 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 32.

The square root of 215455280 is about 14678.3950076294. The cubic root of 215455280 is about 599.4952050522.

The spelling of 215455280 in words is "two hundred fifteen million, four hundred fifty-five thousand, two hundred eighty".