77944229 has 4 divisors (see below), whose sum is σ = 85030080. Its totient is φ = 70858380.

The previous prime is 77944219. The next prime is 77944267. The reversal of 77944229 is 92244977.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77944229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77944229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77944219) 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, 3542909 + ... + 3542930.

It is an arithmetic number, because the mean of its divisors is an integer number (21257520).

Almost surely, 2^77944229 is an apocalyptic number.

It is an amenable number.

77944229 is a deficient number, since it is larger than the sum of its proper divisors (7085851).

77944229 is a wasteful number, since it uses less digits than its factorization.

77944229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7085850.

The product of its digits is 254016, while the sum is 44.

The square root of 77944229 is about 8828.6028906051. The cubic root of 77944229 is about 427.1640103649.

The spelling of 77944229 in words is "seventy-seven million, nine hundred forty-four thousand, two hundred twenty-nine".