77106643 has 4 divisors (see below), whose sum is σ = 77124528. Its totient is φ = 77088760.

The previous prime is 77106637. The next prime is 77106647. The reversal of 77106643 is 34660177.

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 77106643 - 2¹⁷ = 76975571 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77106599 and 77106608.

It is not an unprimeable number, because it can be changed into a prime (77106647) 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, 1938 + ... + 12568.

It is an arithmetic number, because the mean of its divisors is an integer number (19281132).

Almost surely, 2^77106643 is an apocalyptic number.

77106643 is a deficient number, since it is larger than the sum of its proper divisors (17885).

77106643 is a wasteful number, since it uses less digits than its factorization.

77106643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17884.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 77106643 is about 8781.0388337599. The cubic root of 77106643 is about 425.6284000395.

The spelling of 77106643 in words is "seventy-seven million, one hundred six thousand, six hundred forty-three".