690729643 has 2 divisors, whose sum is σ = 690729644. Its totient is φ = 690729642.

The previous prime is 690729593. The next prime is 690729647. The reversal of 690729643 is 346927096.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 690729643 - 2⁹ = 690729131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 690729593 and 690729602.

It is not a weakly prime, because it can be changed into another prime (690729647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345364821 + 345364822.

It is an arithmetic number, because the mean of its divisors is an integer number (345364822).

Almost surely, 2^690729643 is an apocalyptic number.

690729643 is a deficient number, since it is larger than the sum of its proper divisors (1).

690729643 is an equidigital number, since it uses as much as digits as its factorization.

690729643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 46.

The square root of 690729643 is about 26281.7359205970. The cubic root of 690729643 is about 883.9669574506.

The spelling of 690729643 in words is "six hundred ninety million, seven hundred twenty-nine thousand, six hundred forty-three".