690787 has 2 divisors, whose sum is σ = 690788. Its totient is φ = 690786.

The previous prime is 690757. The next prime is 690793. The reversal of 690787 is 787096.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690787 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (690757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345393 + 345394.

It is an arithmetic number, because the mean of its divisors is an integer number (345394).

2⁶⁹⁰⁷⁸⁷ is an apocalyptic number.

690787 is a deficient number, since it is larger than the sum of its proper divisors (1).

690787 is an equidigital number, since it uses as much as digits as its factorization.

690787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 690787 is about 831.1359696223. The cubic root of 690787 is about 88.3991424471.

The spelling of 690787 in words is "six hundred ninety thousand, seven hundred eighty-seven".