215328783 has 16 divisors (see below), whose sum is σ = 317212416. Its totient is φ = 129233280.

The previous prime is 215328781. The next prime is 215328787. The reversal of 215328783 is 387823512.

215328783 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215328783 - 2¹ = 215328781 is a prime.

It is a super-2 number, since 2×215328783² = 92732969576522178, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215328781) 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, 90613 + ... + 92958.

It is an arithmetic number, because the mean of its divisors is an integer number (19825776).

Almost surely, 2^215328783 is an apocalyptic number.

215328783 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

215328783 is a deficient number, since it is larger than the sum of its proper divisors (101883633).

215328783 is a wasteful number, since it uses less digits than its factorization.

215328783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183614.

The product of its digits is 80640, while the sum is 39.

The square root of 215328783 is about 14674.0854229489. The cubic root of 215328783 is about 599.3778578994.

The spelling of 215328783 in words is "two hundred fifteen million, three hundred twenty-eight thousand, seven hundred eighty-three".