77864563 has 4 divisors (see below), whose sum is σ = 88988080. Its totient is φ = 66741048.

The previous prime is 77864561. The next prime is 77864581. The reversal of 77864563 is 36546877.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77864563 - 2¹ = 77864561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77864561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5561748 + ... + 5561761.

It is an arithmetic number, because the mean of its divisors is an integer number (22247020).

Almost surely, 2^77864563 is an apocalyptic number.

77864563 is a deficient number, since it is larger than the sum of its proper divisors (11123517).

77864563 is a wasteful number, since it uses less digits than its factorization.

77864563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11123516.

The product of its digits is 846720, while the sum is 46.

The square root of 77864563 is about 8824.0899247458. The cubic root of 77864563 is about 427.0184274306.

It can be divided in two parts, 778 and 64563, that added together give a triangular number (65341 = T₃₆₁).

The spelling of 77864563 in words is "seventy-seven million, eight hundred sixty-four thousand, five hundred sixty-three".