77381689 has 32 divisors (see below), whose sum is σ = 100290816. Its totient is φ = 57957120.

The previous prime is 77381687. The next prime is 77381723. The reversal of 77381689 is 98618377.

It is a cyclic number.

It is not a de Polignac number, because 77381689 - 2¹ = 77381687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77381687) 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 31 ways as a sum of consecutive naturals, for example, 447207 + ... + 447379.

It is an arithmetic number, because the mean of its divisors is an integer number (3134088).

Almost surely, 2^77381689 is an apocalyptic number.

It is an amenable number.

77381689 is a deficient number, since it is larger than the sum of its proper divisors (22909127).

77381689 is a wasteful number, since it uses less digits than its factorization.

77381689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385.

The product of its digits is 508032, while the sum is 49.

The square root of 77381689 is about 8796.6862510834. The cubic root of 77381689 is about 426.1338838003.

The spelling of 77381689 in words is "seventy-seven million, three hundred eighty-one thousand, six hundred eighty-nine".