77463809 has 2 divisors, whose sum is σ = 77463810. Its totient is φ = 77463808.

The previous prime is 77463767. The next prime is 77463821. The reversal of 77463809 is 90836477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73273600 + 4190209 = 8560^2 + 2047^2 .

It is a cyclic number.

It is not a de Polignac number, because 77463809 - 2¹⁶ = 77398273 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 77463809.

It is not a weakly prime, because it can be changed into another prime (77463409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38731904 + 38731905.

It is an arithmetic number, because the mean of its divisors is an integer number (38731905).

Almost surely, 2^77463809 is an apocalyptic number.

It is an amenable number.

77463809 is a deficient number, since it is larger than the sum of its proper divisors (1).

77463809 is an equidigital number, since it uses as much as digits as its factorization.

77463809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 77463809 is about 8801.3526801282. The cubic root of 77463809 is about 426.2845729504.

The spelling of 77463809 in words is "seventy-seven million, four hundred sixty-three thousand, eight hundred nine".