728099731 has 2 divisors, whose sum is σ = 728099732. Its totient is φ = 728099730.

The previous prime is 728099711. The next prime is 728099791. The reversal of 728099731 is 137990827.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 728099731 - 2⁵ = 728099699 is a prime.

It is a super-2 number, since 2×728099731² = 1060258436564544722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (728099711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364049865 + 364049866.

It is an arithmetic number, because the mean of its divisors is an integer number (364049866).

Almost surely, 2^728099731 is an apocalyptic number.

728099731 is a deficient number, since it is larger than the sum of its proper divisors (1).

728099731 is an equidigital number, since it uses as much as digits as its factorization.

728099731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 728099731 is about 26983.3232015628. The cubic root of 728099731 is about 899.6293663184.

The spelling of 728099731 in words is "seven hundred twenty-eight million, ninety-nine thousand, seven hundred thirty-one".