77681548 has 24 divisors (see below), whose sum is σ = 157913504. Its totient is φ = 32745600.

The previous prime is 77681543. The next prime is 77681561. The reversal of 77681548 is 84518677.

It is a junction number, because it is equal to n+sod(n) for n = 77681498 and 77681507.

It is not an unprimeable number, because it can be changed into a prime (77681543) 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, 21033 + ... + 24448.

Almost surely, 2^77681548 is an apocalyptic number.

It is an amenable number.

77681548 is an abundant number, since it is smaller than the sum of its proper divisors (80231956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77681548 is a wasteful number, since it uses less digits than its factorization.

77681548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45553 (or 45551 counting only the distinct ones).

The product of its digits is 376320, while the sum is 46.

The square root of 77681548 is about 8813.7136327430. The cubic root of 77681548 is about 426.6836063695.

It can be divided in two parts, 7768 and 1548, that added together give a triangular number (9316 = T₁₃₆).

The spelling of 77681548 in words is "seventy-seven million, six hundred eighty-one thousand, five hundred forty-eight".