77641543 has 16 divisors (see below), whose sum is σ = 94808320. Its totient is φ = 62099136.

The previous prime is 77641523. The next prime is 77641547. The reversal of 77641543 is 34514677.

It is a 6-Lehmer number, since φ(77641543) divides (77641543-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 77641543 - 2⁵ = 77641511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77641547) 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 15 ways as a sum of consecutive naturals, for example, 4555 + ... + 13267.

It is an arithmetic number, because the mean of its divisors is an integer number (5925520).

Almost surely, 2^77641543 is an apocalyptic number.

77641543 is a deficient number, since it is larger than the sum of its proper divisors (17166777).

77641543 is a wasteful number, since it uses less digits than its factorization.

77641543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8806.

The product of its digits is 70560, while the sum is 37.

The square root of 77641543 is about 8811.4438657918. The cubic root of 77641543 is about 426.6103482658.

The spelling of 77641543 in words is "seventy-seven million, six hundred forty-one thousand, five hundred forty-three".