77691444 has 24 divisors (see below), whose sum is σ = 183576960. Its totient is φ = 25569024.

The previous prime is 77691413. The next prime is 77691451. The reversal of 77691444 is 44419677.

It is a junction number, because it is equal to n+sod(n) for n = 77691396 and 77691405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40029 + ... + 41924.

It is an arithmetic number, because the mean of its divisors is an integer number (7649040).

Almost surely, 2^77691444 is an apocalyptic number.

It is an amenable number.

77691444 is an abundant number, since it is smaller than the sum of its proper divisors (105885516).

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

77691444 is a wasteful number, since it uses less digits than its factorization.

77691444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82039 (or 82037 counting only the distinct ones).

The product of its digits is 169344, while the sum is 42.

The square root of 77691444 is about 8814.2750127279. The cubic root of 77691444 is about 426.7017242787.

The spelling of 77691444 in words is "seventy-seven million, six hundred ninety-one thousand, four hundred forty-four".