215428813 has 8 divisors (see below), whose sum is σ = 218649600. Its totient is φ = 212220528.

The previous prime is 215428793. The next prime is 215428877. The reversal of 215428813 is 318824512.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215428813 - 2⁵ = 215428781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215428013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34995 + ... + 40687.

It is an arithmetic number, because the mean of its divisors is an integer number (27331200).

Almost surely, 2^215428813 is an apocalyptic number.

It is an amenable number.

215428813 is a deficient number, since it is larger than the sum of its proper divisors (3220787).

215428813 is an equidigital number, since it uses as much as digits as its factorization.

215428813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6251.

The product of its digits is 15360, while the sum is 34.

The square root of 215428813 is about 14677.4934167929. The cubic root of 215428813 is about 599.4706562775.

The spelling of 215428813 in words is "two hundred fifteen million, four hundred twenty-eight thousand, eight hundred thirteen".