623763809 has 2 divisors, whose sum is σ = 623763810. Its totient is φ = 623763808.

The previous prime is 623763799. The next prime is 623763823. The reversal of 623763809 is 908367326.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 598291600 + 25472209 = 24460^2 + 5047^2 .

It is a cyclic number.

It is not a de Polignac number, because 623763809 - 2⁴ = 623763793 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 623763809.

It is not a weakly prime, because it can be changed into another prime (623763839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311881904 + 311881905.

It is an arithmetic number, because the mean of its divisors is an integer number (311881905).

Almost surely, 2^623763809 is an apocalyptic number.

It is an amenable number.

623763809 is a deficient number, since it is larger than the sum of its proper divisors (1).

623763809 is an equidigital number, since it uses as much as digits as its factorization.

623763809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 44.

The square root of 623763809 is about 24975.2639425492. The cubic root of 623763809 is about 854.4239061174.

The spelling of 623763809 in words is "six hundred twenty-three million, seven hundred sixty-three thousand, eight hundred nine".