215145536 has 28 divisors (see below), whose sum is σ = 433936140. Its totient is φ = 105807360.

The previous prime is 215145529. The next prime is 215145547. The reversal of 215145536 is 635541512.

It can be written as a sum of positive squares in 2 ways, for example, as 83905600 + 131239936 = 9160^2 + 11456^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23651 + ... + 31458.

Almost surely, 2^215145536 is an apocalyptic number.

It is an amenable number.

215145536 is an abundant number, since it is smaller than the sum of its proper divisors (218790604).

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

215145536 is an equidigital number, since it uses as much as digits as its factorization.

215145536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55182 (or 55172 counting only the distinct ones).

The product of its digits is 18000, while the sum is 32.

The square root of 215145536 is about 14667.8401954753. The cubic root of 215145536 is about 599.2077840799.

The spelling of 215145536 in words is "two hundred fifteen million, one hundred forty-five thousand, five hundred thirty-six".