77384681 has 4 divisors (see below), whose sum is σ = 84419664. Its totient is φ = 70349700.

The previous prime is 77384669. The next prime is 77384729. The reversal of 77384681 is 18648377.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77384681 - 2¹⁸ = 77122537 is a prime.

It is a super-2 number, since 2×77384681² = 11976777706943522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77384381) 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, 3517475 + ... + 3517496.

It is an arithmetic number, because the mean of its divisors is an integer number (21104916).

Almost surely, 2^77384681 is an apocalyptic number.

It is an amenable number.

77384681 is a deficient number, since it is larger than the sum of its proper divisors (7034983).

77384681 is a wasteful number, since it uses less digits than its factorization.

77384681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7034982.

The product of its digits is 225792, while the sum is 44.

The square root of 77384681 is about 8796.8563134793. The cubic root of 77384681 is about 426.1393759529.

The spelling of 77384681 in words is "seventy-seven million, three hundred eighty-four thousand, six hundred eighty-one".