77708240217 has 32 divisors (see below), whose sum is σ = 116866344960. Its totient is φ = 51026457600.

The previous prime is 77708240173. The next prime is 77708240249. The reversal of 77708240217 is 71204280777.

It is not a de Polignac number, because 77708240217 - 2⁶ = 77708240153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77708247217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 452488 + ... + 600134.

It is an arithmetic number, because the mean of its divisors is an integer number (3652073280).

Almost surely, 2^77708240217 is an apocalyptic number.

It is an amenable number.

77708240217 is a deficient number, since it is larger than the sum of its proper divisors (39158104743).

77708240217 is a wasteful number, since it uses less digits than its factorization.

77708240217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147950 (or 147944 counting only the distinct ones).

The product of its (nonzero) digits is 307328, while the sum is 45.

The spelling of 77708240217 in words is "seventy-seven billion, seven hundred eight million, two hundred forty thousand, two hundred seventeen".