77443320 has 64 divisors (see below), whose sum is σ = 233435520. Its totient is φ = 20553344.

The previous prime is 77443309. The next prime is 77443337. The reversal of 77443320 is 2334477.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25819 + ... + 28661.

It is an arithmetic number, because the mean of its divisors is an integer number (3647430).

Almost surely, 2^77443320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77443320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116717760).

77443320 is an abundant number, since it is smaller than the sum of its proper divisors (155992200).

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

77443320 is a wasteful number, since it uses less digits than its factorization.

77443320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3084 (or 3080 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 30.

The square root of 77443320 is about 8800.1886343419. The cubic root of 77443320 is about 426.2469858721.

Adding to 77443320 its reverse (2334477), we get a palindrome (79777797).

The spelling of 77443320 in words is "seventy-seven million, four hundred forty-three thousand, three hundred twenty".