77986544 has 20 divisors (see below), whose sum is σ = 152598120. Its totient is φ = 38606400.

The previous prime is 77986529. The next prime is 77986547. The reversal of 77986544 is 44568977.

It is a junction number, because it is equal to n+sod(n) for n = 77986492 and 77986501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77986547) 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, 22514 + ... + 25745.

It is an arithmetic number, because the mean of its divisors is an integer number (7629906).

Almost surely, 2^77986544 is an apocalyptic number.

It is an amenable number.

77986544 is a deficient number, since it is larger than the sum of its proper divisors (74611576).

77986544 is a wasteful number, since it uses less digits than its factorization.

77986544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48368 (or 48362 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 50.

The square root of 77986544 is about 8830.9990374815. Note that the first 3 decimals coincide. The cubic root of 77986544 is about 427.2412971435.

The spelling of 77986544 in words is "seventy-seven million, nine hundred eighty-six thousand, five hundred forty-four".