690823087 has 2 divisors, whose sum is σ = 690823088. Its totient is φ = 690823086.

The previous prime is 690823057. The next prime is 690823103. The reversal of 690823087 is 780328096.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 690823087 - 2¹⁵ = 690790319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690823057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345411543 + 345411544.

It is an arithmetic number, because the mean of its divisors is an integer number (345411544).

Almost surely, 2^690823087 is an apocalyptic number.

690823087 is a deficient number, since it is larger than the sum of its proper divisors (1).

690823087 is an equidigital number, since it uses as much as digits as its factorization.

690823087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 690823087 is about 26283.5135969299. The cubic root of 690823087 is about 884.0068175631.

The spelling of 690823087 in words is "six hundred ninety million, eight hundred twenty-three thousand, eighty-seven".