77543806 has 4 divisors (see below), whose sum is σ = 116315712. Its totient is φ = 38771902.

The previous prime is 77543801. The next prime is 77543813. The reversal of 77543806 is 60834577.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77543801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19385950 + ... + 19385953.

It is an arithmetic number, because the mean of its divisors is an integer number (29078928).

Almost surely, 2^77543806 is an apocalyptic number.

77543806 is a deficient number, since it is larger than the sum of its proper divisors (38771906).

77543806 is a wasteful number, since it uses less digits than its factorization.

77543806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38771905.

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 77543806 is about 8805.8960929595. The cubic root of 77543806 is about 426.4312640537.

The spelling of 77543806 in words is "seventy-seven million, five hundred forty-three thousand, eight hundred six".