77908728 has 64 divisors (see below), whose sum is σ = 207152640. Its totient is φ = 24362624.

The previous prime is 77908693. The next prime is 77908729. The reversal of 77908728 is 82780977.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77908729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27925 + ... + 30587.

It is an arithmetic number, because the mean of its divisors is an integer number (3236760).

Almost surely, 2^77908728 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 77908728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103576320).

77908728 is an abundant number, since it is smaller than the sum of its proper divisors (129243912).

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

77908728 is a wasteful number, since it uses less digits than its factorization.

77908728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2748 (or 2744 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 48.

The square root of 77908728 is about 8826.5920943476. The cubic root of 77908728 is about 427.0991475236.

The spelling of 77908728 in words is "seventy-seven million, nine hundred eight thousand, seven hundred twenty-eight".