77620523 has 2 divisors, whose sum is σ = 77620524. Its totient is φ = 77620522.

The previous prime is 77620511. The next prime is 77620531. The reversal of 77620523 is 32502677.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77620523 - 2¹⁰ = 77619499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77620523.

It is not a weakly prime, because it can be changed into another prime (77620723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38810261 + 38810262.

It is an arithmetic number, because the mean of its divisors is an integer number (38810262).

Almost surely, 2^77620523 is an apocalyptic number.

77620523 is a deficient number, since it is larger than the sum of its proper divisors (1).

77620523 is an equidigital number, since it uses as much as digits as its factorization.

77620523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 32.

The square root of 77620523 is about 8810.2510179904. The cubic root of 77620523 is about 426.5718458587.

The spelling of 77620523 in words is "seventy-seven million, six hundred twenty thousand, five hundred twenty-three".