77448681 has 12 divisors (see below), whose sum is σ = 112115952. Its totient is φ = 51519096.

The previous prime is 77448671. The next prime is 77448691. The reversal of 77448681 is 18684477.

It is an interprime number because it is at equal distance from previous prime (77448671) and next prime (77448691).

It is not a de Polignac number, because 77448681 - 2⁹ = 77448169 is a prime.

It is a super-2 number, since 2×77448681² = 11996596377279522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (77448671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5011 + ... + 13416.

It is an arithmetic number, because the mean of its divisors is an integer number (9342996).

Almost surely, 2^77448681 is an apocalyptic number.

It is an amenable number.

77448681 is a deficient number, since it is larger than the sum of its proper divisors (34667271).

77448681 is a wasteful number, since it uses less digits than its factorization.

77448681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18900 (or 18897 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The square root of 77448681 is about 8800.4932248142. The cubic root of 77448681 is about 426.2568212689.

It can be divided in two parts, 774 and 48681, that added together give a triangular number (49455 = T₃₁₄).

The spelling of 77448681 in words is "seventy-seven million, four hundred forty-eight thousand, six hundred eighty-one".