77681332 has 24 divisors (see below), whose sum is σ = 138297600. Its totient is φ = 38172576.

The previous prime is 77681311. The next prime is 77681333. The reversal of 77681332 is 23318677.

It is a junction number, because it is equal to n+sod(n) for n = 77681291 and 77681300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77681333) 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 7 ways as a sum of consecutive naturals, for example, 92169 + ... + 93007.

It is an arithmetic number, because the mean of its divisors is an integer number (5762400).

Almost surely, 2^77681332 is an apocalyptic number.

It is an amenable number.

77681332 is a deficient number, since it is larger than the sum of its proper divisors (60616268).

77681332 is a wasteful number, since it uses less digits than its factorization.

77681332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215 (or 1213 counting only the distinct ones).

The product of its digits is 42336, while the sum is 37.

The square root of 77681332 is about 8813.7013791029. The cubic root of 77681332 is about 426.6832108928.

The spelling of 77681332 in words is "seventy-seven million, six hundred eighty-one thousand, three hundred thirty-two".