77217745 has 16 divisors (see below), whose sum is σ = 104348160. Its totient is φ = 54345600.

The previous prime is 77217737. The next prime is 77217769. The reversal of 77217745 is 54771277.

It is not a de Polignac number, because 77217745 - 2³ = 77217737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77217698 and 77217707.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20940 + ... + 24349.

It is an arithmetic number, because the mean of its divisors is an integer number (6521760).

Almost surely, 2^77217745 is an apocalyptic number.

It is an amenable number.

77217745 is a deficient number, since it is larger than the sum of its proper divisors (27130415).

77217745 is a wasteful number, since it uses less digits than its factorization.

77217745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45336.

The product of its digits is 96040, while the sum is 40.

The square root of 77217745 is about 8787.3628012049. The cubic root of 77217745 is about 425.8327294830.

The spelling of 77217745 in words is "seventy-seven million, two hundred seventeen thousand, seven hundred forty-five".