79777728 has 84 divisors (see below), whose sum is σ = 234058968. Its totient is φ = 25966080.

The previous prime is 79777727. The next prime is 79777757. The reversal of 79777728 is 82777797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79777721) 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 11 ways as a sum of consecutive naturals, for example, 23158 + ... + 26378.

Almost surely, 2^79777728 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 79777728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117029484).

79777728 is an abundant number, since it is smaller than the sum of its proper divisors (154281240).

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

79777728 is a wasteful number, since it uses less digits than its factorization.

79777728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3282 (or 3269 counting only the distinct ones).

The product of its digits is 2420208, while the sum is 54.

The square root of 79777728 is about 8931.8378847805. The cubic root of 79777728 is about 430.4875090970.

The spelling of 79777728 in words is "seventy-nine million, seven hundred seventy-seven thousand, seven hundred twenty-eight".