690484987 has 2 divisors, whose sum is σ = 690484988. Its totient is φ = 690484986.

The previous prime is 690484981. The next prime is 690485021. The reversal of 690484987 is 789484096.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 690484987 - 2⁷ = 690484859 is a prime.

It is not a weakly prime, because it can be changed into another prime (690484981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345242493 + 345242494.

It is an arithmetic number, because the mean of its divisors is an integer number (345242494).

Almost surely, 2^690484987 is an apocalyptic number.

690484987 is a deficient number, since it is larger than the sum of its proper divisors (1).

690484987 is an equidigital number, since it uses as much as digits as its factorization.

690484987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The square root of 690484987 is about 26277.0810213007. The cubic root of 690484987 is about 883.8625782814.

The spelling of 690484987 in words is "six hundred ninety million, four hundred eighty-four thousand, nine hundred eighty-seven".