77944977 has 64 divisors (see below), whose sum is σ = 133297920. Its totient is φ = 44582400.

The previous prime is 77944969. The next prime is 77945081.

77944977 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 77944977 - 2³ = 77944969 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77944577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 450463 + ... + 450635.

It is an arithmetic number, because the mean of its divisors is an integer number (2082780).

Almost surely, 2^77944977 is an apocalyptic number.

It is an amenable number.

77944977 is a deficient number, since it is larger than the sum of its proper divisors (55352943).

77944977 is a wasteful number, since it uses less digits than its factorization.

77944977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271 (or 265 counting only the distinct ones).

The product of its digits is 3111696, while the sum is 54.

The square root of 77944977 is about 8828.6452528120. The cubic root of 77944977 is about 427.1653768020.

The spelling of 77944977 in words is "seventy-seven million, nine hundred forty-four thousand, nine hundred seventy-seven".