728216431 has 2 divisors, whose sum is σ = 728216432. Its totient is φ = 728216430.

The previous prime is 728216407. The next prime is 728216441. The reversal of 728216431 is 134612827.

It is a strong prime.

It is an emirp because it is prime and its reverse (134612827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 728216431 - 2¹⁵ = 728183663 is a prime.

It is a super-2 number, since 2×728216431² = 1060598340756755522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728216441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364108215 + 364108216.

It is an arithmetic number, because the mean of its divisors is an integer number (364108216).

Almost surely, 2^728216431 is an apocalyptic number.

728216431 is a deficient number, since it is larger than the sum of its proper divisors (1).

728216431 is an equidigital number, since it uses as much as digits as its factorization.

728216431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 34.

The square root of 728216431 is about 26985.4855616867. The cubic root of 728216431 is about 899.6774280211.

The spelling of 728216431 in words is "seven hundred twenty-eight million, two hundred sixteen thousand, four hundred thirty-one".