215135520 has 48 divisors (see below), whose sum is σ = 677678400. Its totient is φ = 57369344.

The previous prime is 215135519. The next prime is 215135521. The reversal of 215135520 is 25531512.

It is a happy number.

215135520 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (215135519) and next prime (215135521).

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

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (215135521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223620 + ... + 224579.

It is an arithmetic number, because the mean of its divisors is an integer number (14118300).

Almost surely, 2^215135520 is an apocalyptic number.

215135520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215135520 is an abundant number, since it is smaller than the sum of its proper divisors (462542880).

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

215135520 is a wasteful number, since it uses less digits than its factorization.

215135520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448217 (or 448209 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 215135520 is about 14667.4987642747. The cubic root of 215135520 is about 599.1984853227.

The spelling of 215135520 in words is "two hundred fifteen million, one hundred thirty-five thousand, five hundred twenty".