215428747 has 2 divisors, whose sum is σ = 215428748. Its totient is φ = 215428746.

The previous prime is 215428721. The next prime is 215428751. The reversal of 215428747 is 747824512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215428747 - 2¹¹ = 215426699 is a prime.

It is not a weakly prime, because it can be changed into another prime (215428757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107714373 + 107714374.

It is an arithmetic number, because the mean of its divisors is an integer number (107714374).

Almost surely, 2^215428747 is an apocalyptic number.

215428747 is a deficient number, since it is larger than the sum of its proper divisors (1).

215428747 is an equidigital number, since it uses as much as digits as its factorization.

215428747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125440, while the sum is 40.

The square root of 215428747 is about 14677.4911684525. The cubic root of 215428747 is about 599.4705950584.

The spelling of 215428747 in words is "two hundred fifteen million, four hundred twenty-eight thousand, seven hundred forty-seven".