690728723 has 2 divisors, whose sum is σ = 690728724. Its totient is φ = 690728722.

The previous prime is 690728719. The next prime is 690728777. The reversal of 690728723 is 327827096.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 690728723 - 2² = 690728719 is a prime.

It is not a weakly prime, because it can be changed into another prime (690728923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345364361 + 345364362.

It is an arithmetic number, because the mean of its divisors is an integer number (345364362).

Almost surely, 2^690728723 is an apocalyptic number.

690728723 is a deficient number, since it is larger than the sum of its proper divisors (1).

690728723 is an equidigital number, since it uses as much as digits as its factorization.

690728723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 690728723 is about 26281.7184179422. The cubic root of 690728723 is about 883.9665649912.

The spelling of 690728723 in words is "six hundred ninety million, seven hundred twenty-eight thousand, seven hundred twenty-three".