77229643 has 4 divisors (see below), whose sum is σ = 78538680. Its totient is φ = 75920608.

The previous prime is 77229641. The next prime is 77229667. The reversal of 77229643 is 34692277.

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 77229643 - 2¹ = 77229641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77229596 and 77229605.

It is not an unprimeable number, because it can be changed into a prime (77229641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 654430 + ... + 654547.

It is an arithmetic number, because the mean of its divisors is an integer number (19634670).

Almost surely, 2^77229643 is an apocalyptic number.

77229643 is a deficient number, since it is larger than the sum of its proper divisors (1309037).

77229643 is a wasteful number, since it uses less digits than its factorization.

77229643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309036.

The product of its digits is 127008, while the sum is 40.

The square root of 77229643 is about 8788.0397700511. The cubic root of 77229643 is about 425.8545996616.

The spelling of 77229643 in words is "seventy-seven million, two hundred twenty-nine thousand, six hundred forty-three".